Flatbed Trailer Types: Standard, Step Deck, RGN, Double Drop

Why Flatbed Trailer Type Determines Your Freight Market

Flatbed trucking pays more per mile than dry van or reefer — DAT reports average flatbed spot rates of $2.68 per mile nationally — but the flatbed market is not monolithic. The type of flatbed trailer you own determines which freight you can legally haul, which shippers you can serve, and how much you earn per load. A standard flatbed, step deck, RGN (Removable Gooseneck), and double drop are not interchangeable — each serves a distinct cargo profile defined by federal weight and dimension regulations.

FMCSA's size and weight regulations under 49 CFR 658 and the Federal Bridge Formula set the maximum legal dimensions for freight without permits: 8 feet 6 inches wide, 13 feet 6 inches tall (from road surface), and 80,000 pounds GVWR. Everything above those limits requires oversize or overweight permits from each state you transit, adding $50-$500 per state in permit fees and restricting travel to permitted routes and daylight hours.

The critical measurement is deck height — the distance from the road surface to the trailer floor. A standard flatbed deck sits at 60 inches (5 feet), leaving 8 feet 6 inches of legal height clearance for cargo. A step deck drops the rear section to 42 inches, gaining 18 inches of height clearance. An RGN drops even further to 24-30 inches in the well, accommodating equipment up to 10-11 feet tall without overheight permits. Understanding these dimensions is not optional — an overheight load on the wrong trailer results in bridge strikes, DOT fines, and potentially fatal accidents. See flatbed earnings potential at /earnings/flatbed before choosing your trailer type.

Standard Flatbed: The Versatile Workhorse of Open-Deck Freight

The standard flatbed trailer is a flat, level deck typically 48 or 53 feet long and 102 inches wide, sitting 60 inches off the ground. It is the most common flatbed trailer type, representing approximately 60% of the flatbed fleet according to TMC data. Its flat deck with no walls or roof makes it the most versatile trailer for loading and unloading — forklifts, cranes, and side-loading equipment can access cargo from any direction.

Standard flatbeds haul the broadest range of freight: lumber, steel coils and beams, building materials, machinery, pipe, precast concrete, solar panels, and military equipment. The 48-foot flatbed is the industry standard for steel and lumber because these commodities are typically shipped in bundles that fit perfectly on a 48-foot deck. The 53-foot flatbed is preferred for lighter but longer cargo like structural steel beams, wind turbine components, and manufactured housing.

Legal load capacity on a standard 48-foot flatbed is approximately 48,000 pounds (80,000 GVWR minus 32,000 pounds for tractor and empty trailer). Maximum legal cargo height is 8 feet 6 inches (13 feet 6 inches total minus 5 feet deck height). Maximum cargo width is 8 feet 6 inches without overwidth permits.

Securement requirements under FMCSA's 49 CFR 393.100-136 are extensive for flatbed freight. The cargo securement rules specify minimum tiedown working load limits based on cargo weight: one tiedown for articles 5 feet or shorter, two tiedowns for articles longer than 5 feet, plus one additional tiedown for every 10 feet of length. Steel coils require specific securement methods detailed in 49 CFR 393.120. A proper set of flatbed securement gear (straps, chains, binders, tarps, edge protectors, corner protectors) costs $2,000-$4,000 and weighs 500-800 pounds.

Step Deck (Drop Deck): 18 Extra Inches That Open New Markets

A step deck trailer — also called a drop deck — has a two-level deck: a shorter upper section near the gooseneck and a longer lower section that drops down 18 inches. The upper deck sits at the same 60-inch height as a standard flatbed, while the lower deck drops to 42 inches. This seemingly small 18-inch difference opens up an entirely different freight market: equipment and machinery that stands between 8 feet 6 inches and 10 feet tall.

Construction equipment, agricultural machinery, large generators, industrial compressors, and tall manufacturing equipment often measure 9-10 feet in height. On a standard flatbed, this cargo would be 14-15 feet above the road surface — requiring overheight permits in every state, restricted routes, and escort vehicles. On a step deck, the same cargo clears the 13-foot-6-inch legal limit without any permits, saving $500-$3,000 in permit costs per load and eliminating the routing restrictions that add deadhead miles and transit time.

Step deck rates typically pay $0.15-$0.30 more per mile than standard flatbed because fewer carriers own step decks (only about 20% of the flatbed fleet) and the freight requires more specialized loading knowledge. A step deck owner-operator running the same lanes as a standard flatbed operator can earn $1,500-$3,000 more per month in gross revenue.

New 53-foot step deck trailers cost $38,000-$55,000 from manufacturers like Fontaine, Reitnouer, and Trail King. Used step decks with 5-8 years of service sell for $18,000-$30,000. The step deck's main limitation is reduced upper deck length — typically 11-13 feet of upper deck and 37-40 feet of lower deck — which restricts how you can distribute weight on long, heavy loads. Use /tools/cost-per-mile-calculator to model the revenue premium against the higher trailer cost.

RGN (Removable Gooseneck): The Heavy Haul Specialist

The RGN — Removable Gooseneck trailer — is the specialized tool of heavy haul and oversize freight. Its defining feature is a gooseneck section that detaches hydraulically, allowing the front of the trailer to lower to ground level and create a ramp. Equipment can be driven or winched directly onto the trailer deck without a crane or loading dock. This self-loading capability makes the RGN essential for hauling tracked equipment (excavators, bulldozers, track loaders), wheeled construction equipment, and any oversized machinery that cannot be lifted by conventional means.

The RGN deck sits at 24-30 inches off the ground in the well area (the lowest section between the axle groups), providing 10-11 feet of legal height clearance for cargo — enough to haul most construction equipment without overheight permits. Standard RGN configurations handle 40,000-50,000 pounds on 2-3 axle rear groups. Heavy haul RGNs with 4-9 axle configurations can handle 80,000-150,000+ pounds, though these loads always require overweight permits and route surveys.

RGN freight commands the highest rates in the flatbed segment. Single-axle equipment moves at $3.00-$4.50 per mile. Oversized permitted loads pay $4.00-$8.00+ per mile depending on permit requirements, escort vehicles, and routing complexity. A skilled RGN operator with oversize load experience can gross $250,000-$400,000 annually — but the startup costs are equally higher.

New RGN trailers cost $60,000-$120,000 depending on axle configuration, deck length, and hydraulic system. Popular manufacturers include Trail King, Talbert, Fontaine Specialized, and XL Specialized. Used 2-axle RGNs sell for $25,000-$55,000. Insurance for RGN operations is significantly higher — $18,000-$35,000 per year — because cargo values routinely exceed $500,000 and oversize loads carry elevated accident risk. FMCSA's oversize and overweight permitting varies by state; the FHWA's Oversize/Overweight Load Permit Procedures manual provides state-by-state requirements.

Double Drop and Specialized Trailers: Niche Markets With Premium Rates

A double drop (also called a lowboy) trailer looks similar to a step deck but drops the center well section even lower — to 18-24 inches off the ground. This creates maximum height clearance of 11-12 feet for cargo, surpassing even the RGN's well depth. Double drops are purpose-built for extremely tall cargo that must travel without overheight permits: large industrial transformers, tall manufacturing presses, reactor vessels, and pre-assembled building modules.

Unlike an RGN, most double drops do not have a removable gooseneck, so cargo must be crane-loaded from above. This limits their use to freight that originates and terminates at facilities with overhead crane capability — typically manufacturing plants, power plants, refineries, and heavy industrial sites. The niche nature of double drop freight means fewer available loads but significantly higher rates: $3.50-$6.00 per mile for legal-dimension loads and $5.00-$10.00+ per mile for permitted oversize moves.

Beyond the four main types, the specialized flatbed market includes stretch trailers (extendable from 48 to 80+ feet for long structural steel, poles, and wind turbine blades), beam trailers (two separate bunk sets connected by the cargo itself, used for bridge beams and long pipe), and multi-axle platform trailers for extreme weight. Each niche has its own permitting requirements, insurance considerations, and rate structures.

New double drop trailers cost $50,000-$90,000, with used units at $20,000-$45,000. The market for double drop freight is concentrated in the industrial corridor from the Gulf Coast through the Midwest, with heavy demand around Houston, Chicago, Detroit, and Pittsburgh. Owner-operators considering double drop or specialized trailers should have at least 2 years of standard flatbed experience before moving into these demanding niches. Securement for tall, heavy cargo on low-deck trailers follows FMCSA 49 CFR 393 requirements, but the practical skill of balancing and securing these loads takes significant training. See /guides/how-to-start-flatbed-trucking for a complete guide to entering the flatbed market.

Which Flatbed Trailer to Buy: A Decision Guide for Owner-Operators

Your first flatbed trailer should match the freight market you plan to serve. Here is our decision framework based on operating data, freight availability, and startup costs.

Buy a standard flatbed if: you are new to flatbed trucking, you want the highest load availability on load boards, you haul lumber or steel or building materials, you want the lowest trailer investment, or you need maximum flexibility across freight types. The standard flatbed is the safest first purchase because it accesses 60% of all flatbed freight. Budget $22,000-$35,000 for a quality used 48-footer or $35,000-$50,000 new.

Buy a step deck if: you have 6-12 months of flatbed experience, you want to access equipment and machinery freight that pays $0.15-$0.30 more per mile, you operate near construction-heavy markets (Texas, Florida, Southeast), or you want to differentiate yourself from standard flatbed competition. The step deck is the best second trailer purchase for an owner-operator building a fleet. Budget $18,000-$30,000 used or $38,000-$55,000 new.

Buy an RGN if: you have 2+ years of flatbed experience including oversize load handling, you have established relationships with heavy equipment dealers and construction companies, you are prepared for the higher insurance costs ($18,000-$35,000 annually), and you want to earn $3.00-$8.00+ per mile on specialized loads. The RGN requires the highest investment but generates the highest revenue per mile in the flatbed segment. Budget $25,000-$55,000 used or $60,000-$120,000 new.

Many successful flatbed owner-operators follow a progression: start with a standard flatbed for 1-2 years, add a step deck, then move into RGN work. This builds the securement skills, shipper relationships, and insurance history needed for each step up. Every flatbed carrier needs proper securement training — FMCSA's North American Cargo Securement Standard under 49 CFR 393 is your regulatory bible, and the TMC Recommended Practices manual provides additional practical guidance. Check our detailed flatbed earnings data at /earnings/flatbed for revenue expectations by trailer type and region.