Flatbed trucks are designed for oversized, heavy, or irregularly shaped cargo that won't fit inside an enclosed body - think steel beams, construction equipment, industrial machinery, and agricultural implements. Whether you're a contractor adding a work-ready hauler to your fleet, a farm operation moving implements between fields, or a seller looking to price a unit competitively, understanding the differences between flatbed types, the specs that actually matter, and how to match a truck to your loads will save you time and money. This page covers the main flatbed truck types listed on IronMartOnline, what to look for on a used unit's spec sheet, and how to choose the right configuration for your operation.
Not every flatbed is the same vehicle. Deck heights, lengths, and configurations vary widely - and the right choice depends on what you're hauling, how far, and how you need to load it. IronMartOnline regularly lists a mix of medium-duty straight trucks, heavy-duty tractor–trailer combos, step deck trailers, and lowboy equipment haulers, with units from makers like Freightliner, International, Mack, and Fontaine.
A standard flatbed straight truck is a single vehicle - cab, chassis, and a flat open bed with no fixed sides or roof - typically with a truck bed length of 18–26 feet and a width of 8′6″ (102″). Common chassis include the Freightliner M2 106, International 4300, and Ford F-650/F-750, with GVWR ranges generally falling between 26,000 and 33,000+ lbs. These trucks are incredibly versatile for local and regional work: delivering lumber, building materials, pipe, palletized goods, and small to mid-size machines like skid steers or compact tractors. Contractors, building supply yards, and smaller fleets favor straight flatbeds because they're maneuverable, simpler to license (many can be spec'd below CDL thresholds), and cost less to purchase and maintain than a tractor–trailer combination. A Freightliner M2 with a 26′ Morgan steel flatbed is a representative example of what these units look like in used inventory.
This configuration pairs a Class 8 highway tractor with a flatbed trailer that runs 48–53 feet in deck length - or even longer on an extended flatbed with permits. The standard deck width is 8′6″, and construction ranges from all-steel to aluminum combo builds. Axle setups include tandem, spread axle, and tri-axle options. Flatbed trucks and trailers in this class can transport loads up to 80,000 pounds gross under federal weight limits, with standard flatbeds carrying up to about 48,000 pounds of payload depending on tractor and trailer tare weight. Common cargo includes structural steel, precast concrete panels, containers, long lumber, and large equipment. These are over-the-road units used by carriers and large construction and industrial fleets hauling across states. Units like the Fontaine 48′ steel flatbed trailer or the Transcraft 48′ combo trailer show what's commonly available.
A step deck trailer - also called a drop deck or single drop deck - features two sections: a slightly higher front deck near the gooseneck and a lower main deck at the rear. The upper deck sits at approximately 52–60″ and the lower deck drops to roughly 36–42″ off the ground. This design provides extra vertical clearance so taller loads can stay beneath the 13′6″ legal height limit that most states enforce. Step deck trailers can carry up to 45,000 pounds of cargo and are the go-to choice when you need to transport tall items like excavators, dozers, combine harvesters, or farm tractors that would exceed headroom restrictions on a standard flatbed. A stretch single drop deck adds usable length for longer machinery. Flatbed trailers can be up to 55 feet long for larger loads in stretched configurations. IronMartOnline frequently brokers step decks for heavy equipment hauling - see listings like the FONTAINE 48′ × 102″ step deck or the Dorsey 35′ Steel Giant step deck, which is specifically built for tight spaces and urban turns.
Lowboy trailers and RGN trailers are specialized low-profile haulers where the bed sits extremely close to ground level - typically just 18–24″ off the ground in the well area. This unique type of trailer solves two problems at once: it lets you haul the tallest and heaviest machinery (dozers, large excavators, cranes, mining equipment) while staying under height restrictions, and the removable gooseneck design allows effortless loading by detaching the front neck so equipment can be driven or rolled directly onto the deck from the ground via two ramps or simply under its own power. Lowboy trailers typically have a cargo capacity of 40,000 pounds in standard configurations, while double drop trailers - and multi-axle RGN builds - can transport up to 80,000 pounds or more. RGN trailers allow for quick loading of heavy equipment, which is why they're preferred for self-propelled machines. Though they're technically a separate category from simple straight flatbeds, equipment buyers commonly search for them under "flatbed trucks," so IronMartOnline includes them in the broader discussion. Browse options like the Talbert RGN 50-ton lowboy or the Fontaine 60-ton RGN trailer for real examples.
Flatbed service beds are compact open-deck bodies mounted on pickup trucks and light to medium-duty chassis - think Ford F-350/F-450, Ram 3500, and Chevy 3500. Deck lengths run 8–12 feet with skirted sides, underbody toolboxes, integrated hitches, and sometimes racks for pipe or material. Steel beds are rugged and cheaper; aluminum beds are lighter and resist corrosion. Typical users include welders, farmers, ranchers, and small contractors who need both cargo capacity on an open bed and organized on-board tool storage. These smaller flatbed work trucks appear regularly in IronMartOnline's used inventory and are attractive to owner-operators upgrading from traditional trucks with standard pickup beds.
A spec sheet tells you what a flatbed truck can do; an inspection tells you what it will do for you. Below are the features that matter most for safety, legal compliance, and resale value on any used flatbed truck or trailer.
GVWR (Gross Vehicle Weight Rating) is the maximum allowable weight of the vehicle including cab, chassis, body, fuel, driver, and cargo. For tractor–trailer combos, the relevant number is GCWR (Gross Combination Weight Rating). Flatbed trucks can carry up to 80,000 pounds gross under federal bridge law, though usable payload is always GVWR minus the vehicle's curb weight. Medium-duty straight flatbeds typically fall in Class 6–7 (19,501–33,000 lbs GVWR). Calculate your real payload before buying: if you plan to carry 20,000 lbs of steel but the truck's curb weight leaves only 15,000 lbs of capacity, you'll face overload fines, accelerated wear on axles and brakes, and serious safety risk. Conversely, over-specifying - buying far more capacity than you need - inflates purchase price, insurance, and fuel costs unnecessarily. Proper weight distribution prevents overloading issues and prevents accidents during transport. Check the axle rating plates (steer, drive, and trailer axles) against your typical loads to confirm each axle can handle its share.
Common deck lengths range from 18–26 feet on straight trucks to 40–53 feet on flatbed trailers. Standard legal width in North America is 8′6″ (102″); anything wider requires oversize permits. Deck height - the distance from the ground to the deck surface - directly determines how much vertical space remains for your load under 13′6″ low bridges and overpasses. A standard flatbed trailer with a deck height around 48–60″ allows cargo up to roughly 8′6″ tall. A step deck's lower section at 36–42″ accommodates taller loads up to about 10 feet. A lowboy or RGN well at 18–24″ can handle items 11′ or more before triggering permit requirements. Match deck length to your typical load footprints: hauling two compact excavators side by side requires different dimensions than a single large dozer or bundles of 20–40 ft steel beams.
Steel decks are rugged, less expensive to repair, and handle impact well - but they're heavier and prone to rust, especially in regions with road salt. Aluminum decks are lighter (improving payload capacity per pound of gross weight allowed), more corrosion-resistant, and tend to hold higher resale value, but they're more brittle under impact and costlier to weld. Wood-plank decking is cheap and easy to replace board by board but subject to rot and warping over time; items on wooden decks are also more easily damaged if planks fail under load. On used units - particularly those from the 1990s through 2010s - inspect carefully for rust in the underbody and cross members, cracked welds where crossmembers join the frame rails, bent or twisted frame rails, sagging deck surfaces, and uneven tire wear that may signal structural misalignment. Straight frame rails, a true deck surface, and evenly worn tires are signs of a healthy unit.
Flatbed trucks enable loading from the top, sides, or rear using cranes or forklifts - but that open-access advantage means cargo must be secured with straps or chains to prevent shifting. Key hardware to look for includes stake pockets along the deck edges, rub rails, chain pockets, D-rings, winch tracks, and an integrated bulkhead or headache rack between the cab and deck to stop cargo from slamming forward if the truck suddenly stops. Ratchet straps, winches, and binders should be rated for the loads you plan to carry. Flatbeds have higher labor requirements for securing loads compared to enclosed trucks - plentiful, well-placed tie-down points reduce loading time and help you comply with DOT cargo securement rules. Valuable add-ons that increase a truck's usability and resale value include underbody toolboxes, removable side rails, loading ramps for the rear, and onboard winches for pulling heavy items onto the deck.
Engine brand matters for parts availability and driver familiarity. Common diesel powerplants include Cummins, Detroit, and International; Caterpillar engines appear on older units. Horsepower and torque ratings determine how the vehicle performs on grades under heavy loads - underpowered trucks wear faster, run hotter, and slow traffic. Transmission types affect driver comfort and resale: automated manuals and automatics are increasingly preferred over traditional manual gearboxes (10-speed, 13-speed, 18-speed) for operator ease, though some experienced drivers still favor manuals for control. When evaluating a used flatbed, consider both odometer mileage and engine hours - high highway miles with low hours may indicate lighter duty than low miles with high hours from constant jobsite cycling. A well-maintained heavy-duty tractor can reach 500,000–1,000,000+ miles; medium-duty straight flatbeds commonly serve 10–20 years depending on duty cycle. Strong air brakes with current linings, healthy drums or discs, and up-to-date maintenance records are non-negotiable, especially on older units.
A Class A CDL is required when operating a vehicle combination with a GCWR of 26,001 lbs or more and the towed unit's GVWR exceeds 10,000 lbs. Class B covers single vehicles at or above 26,001 lbs GVWR when the trailer stays at or below 10,000 lbs. Beyond licensing, oversize and overweight permits are needed whenever length, width, height, or weight exceeds state limits - and permit fees are rising. When assessing a used flatbed listed on IronMartOnline, look for maintenance logs, prior DOT inspection reports, clear titles with accurate VIN, and disclosure of any structural repairs or crashes. Missing paperwork or non-compliant modifications (lifted frames, non-standard suspensions, widened axles) can slow down resale, delay fleet onboarding, and affect insurability.
Choosing the right flatbed comes down to matching what you haul, where you haul it, and who's driving to the truck type and specs that fit. Here's a simple decision framework for contractors, fleet managers, and owner-operators.
Primary Application and Cargo Type - Define your main use. Hauling construction equipment like excavators and dozers points toward a step deck or lowboy/RGN for the vertical clearance and easy loading they provide. Moving construction materials and building materials on local routes favors a medium-duty straight truck. Mixed freight across states calls for a standard 48–53 ft flatbed trailer behind a highway tractor.
Typical Load Size, Weight, and Route Length - Frequent local runs with lighter loads point toward a medium-duty flatbed truck. Heavy machinery or industrial machinery going long distances may require a tractor plus a full-length flatbed or lowboy. Flatbeds allow ground-level loading without ramps in many configurations, saving time and effort on repetitive routes. Using ramps allows for safer loading and unloading of cargo when ground-level access isn't possible.
Budget and Total Cost of Ownership - Balance purchase price against remaining service life, fuel consumption, expected repair costs, and resale value. A slightly newer, well-documented used truck on IronMartOnline can be cheaper in the long run than a bargain with hidden structural damage. Major drawbacks of flatbed trucks include weather vulnerability and increased securing requirements - factor tarp costs, weather protection measures, and tie-down labor into operating budgets. Cargo that is easily damaged by rain or sun may need additional coverings.
Driver Skill, Licensing, and Comfort - CDL class, experience with manual vs. automatic transmissions, and comfort features (air-ride seats, sleeper cab for OTR work) determine which trucks are practical for your team. If your drivers only hold a Class B CDL, a tractor–trailer combination is off the table without additional training and testing.
Future Flexibility and Resale - Choose specs that won't box your fleet into a single niche. Versatile deck length, ample tie-down points, and popular engine/transmission combos hold value better if the business grows or your haulage needs change. Standard widths and common configurations attract more buyers when it's time to sell.
IronMartOnline's team can help match seller inventory to serious buyers, assist buyers in interpreting listings, and arrange inspections and transport for units anywhere in the country.
Below are the practical buying and ownership questions buyers and sellers most often ask when dealing with used flatbed trucks.
A flatbed truck is any vehicle with a flat, open deck - no fixed sides or roof - built so that loads can be placed from the sides, rear, or above by crane, forklift, or ramp. Flatbed trucks are commonly used in construction, heavy machinery transport, and large industrial freight. Unlike box trucks or dry vans, flatbeds lack weather protection for sensitive cargo, but they're the preferred option when cargo shape, size, or loading requirements matter more than weather protection. Flatbeds are ideal for oversized and oddly shaped items - steel beams, machinery, and large equipment that simply won't fit through the rear doors of a traditional enclosed body. Common cargo transported by flatbed trucks includes steel beams, machinery, and large equipment. If your freight is palletized, temperature-sensitive, or theft-prone, an enclosed truck type may be the better call.
In the U.S., a CDL is generally required when the GVWR or GCWR reaches 26,001 lbs or more. A Class A CDL is needed for tractor–trailer combinations where the trailer's GVWR exceeds 10,000 lbs, while a Class B covers single vehicles at or above 26,001 lbs GVWR. Many medium-duty flatbed trucks are deliberately spec'd just under CDL thresholds - for instance, at 25,999 lbs GVWR - to simplify driver hiring. Most tractor–flatbed trailer combinations and all lowboy/RGN setups require a Class A. Always confirm local and state requirements and check the specific ratings listed in each IronMartOnline listing before purchasing.
Buying a complete used unit gets you to work faster: the configuration is known, the truck bed and cab are matched, and there's no waiting on a body upfitter. It's often the lower total-cost option as well. Adding a new flatbed body to an existing chassis makes sense when you already own a solid cab and chassis and want a custom deck length, material, or accessory layout - plus you may get a warranty on the new body. IronMartOnline primarily focuses on complete used flatbed trucks and trailers but can help sellers monetize surplus chassis or deck bodies separately.
Well-maintained heavy-duty highway tractors commonly reach 500,000–1,000,000+ miles in service. Medium-duty straight flatbeds used in construction or municipal work typically last 10–20 years depending on duty cycle. Regular maintenance ensures the longevity of flatbed trucks - and flatbed trucks can last many years with proper care. Factors that shorten life include corrosion from road salt, chronic overloading, deferred maintenance, and constant off-road use. Always review the maintenance history and consider a pre-purchase inspection; IronMartOnline can connect buyers with inspection and brokerage resources.
Start with the frame and deck: look for rust, cracks in welds, bent crossmembers, rotten wood planks, and sagging surfaces. Check tire condition and even wear (uneven wear may indicate frame misalignment). Inspect brakes - linings, drums or discs, air system components - and all lights and electrical. If the truck has hydraulic or PTO systems, test them under load. Review service records, oil analysis reports where available, and verify VIN, mileage, and title status. Loading heavy items can be challenging on flatbeds, so confirm that tie-down hardware, loading ramps, and any winches function correctly. Detailed photos, videos, and transparent descriptions on IronMartOnline listings are designed to support remote inspections and reduce surprises.
Suitability depends on the machine's weight, dimensions, and center of gravity versus the truck's payload rating, deck size, and tie-down options. Flatbed trucks are the preferred option when cargo shape, size, or loading requirements matter more than weather protection - and they are ideal for oversized items difficult for conventional vehicles. Compare your machine specs to the capacity and dimensions on each listing. Account for the unloading process as well: does the trailer have a ramp for drive-on loading, or will you need a crane? For tracked equipment, an RGN trailer with a detachable gooseneck provides the safest, easiest loading method. IronMartOnline staff can help buyers match specific machines to appropriate flatbed trucks and trailers already in inventory.
Flatbed trucks remain essential for moving heavy equipment, construction materials, and agricultural machinery efficiently - and the right used unit, properly matched to your loads, delivers serious value without the new-truck price tag. Explore IronMartOnline's current inventory of used flatbed trucks, step decks, and lowboy equipment haulers, or reach out to our team to price and sell your existing units. IronMartOnline handles listing creation, buyer screening, negotiations, and logistics - so you can focus on the job, not the sale.