Flatbed Trailer Dimensions, Weight Limits & Load Requirements
Flatbed is the most common open-deck equipment you'll book as a freight broker. Before you quote a load, you need to know whether the cargo fits within legal dimensions, what weight the trailer can carry, and whether tarping will be required. This guide covers the specs you'll use every day.
What Is a Flatbed Trailer?
A flatbed trailer is an open-deck trailer with no sides, no roof, and no nose. Freight is loaded from any direction using a forklift or crane and secured with straps, chains, and blocking. The open design makes flatbeds ideal for freight that is oversized, heavy, or too awkward for a van — steel coils, lumber, machinery, and building materials are all typical flatbed commodities.
Standard Flatbed Dimensions
Two lengths dominate the market. Most flatbed freight moves on 48-foot trailers, which are more maneuverable and available in larger numbers. 53-foot flatbeds exist but are less common and command a slight premium.
Standard flatbed trailer specifications
| Spec | 48-Foot Flatbed | 53-Foot Flatbed |
|---|---|---|
| Deck length | 48 ft (576 in) | 53 ft (636 in) |
| Deck width | 8 ft 6 in (102 in) | 8 ft 6 in (102 in) |
| Deck height | ~58–60 in from ground | ~58–60 in from ground |
| Legal freight height | Up to 8 ft 6 in (no permit) | Up to 8 ft 6 in (no permit) |
| Overall legal height | 13 ft 6 in max | 13 ft 6 in max |
| Typical payload | 47,000–48,000 lbs | 43,000–45,000 lbs |
Federal Weight Limits
The U.S. federal gross vehicle weight limit is 80,000 lbs. That weight is distributed across axles — exceeding any single axle limit triggers a permit requirement even if the gross weight is under 80,000 lbs.
U.S. federal axle weight limits
| Axle Configuration | Max Legal Weight |
|---|---|
| Steer axle (single) | 20,000 lbs |
| Single drive axle | 20,000 lbs |
| Tandem drive axles | 34,000 lbs combined |
| Tandem trailer axles | 34,000 lbs combined |
| Gross vehicle weight (GVW) | 80,000 lbs |
A standard tractor weighs approximately 30,000–34,000 lbs unloaded. That leaves roughly 46,000–48,000 lbs of net payload capacity on a 48-foot flatbed under federal limits.
Common Flatbed Commodities
Flatbeds move freight that cannot be loaded into an enclosed trailer — either because of size, weight, loading requirements, or all three.
- Steel products: coils, sheet, plate, pipe, structural beams
- Lumber and building materials: engineered wood, plywood, trusses
- Construction equipment: skid steers, excavators, compactors (if height allows)
- Manufactured goods: HVAC units, precast concrete, tank sections
- Agricultural: large farm equipment, irrigation systems
- Wind energy: tower sections, nacelle components (usually oversize)
- Military: vehicles, equipment (requires additional compliance)
Tarping and Securement Requirements
Tarping requirements are set by the shipper, the carrier, or sometimes contractually by the consignee — not by the broker. That said, knowing what's typically required prevents surprises when a carrier quotes a tarp surcharge or refuses the load.
| Commodity Type | Typical Tarping Requirement |
|---|---|
| Steel coils | Full tarp — moisture causes surface rust claims |
| Steel sheet / plate | Often tarped — shipper preference |
| Lumber | Typically tarped — rain damage liability |
| Machinery | Varies — often untarped if weatherproof |
| Construction equipment | Usually untarped unless electronics exposed |
| Coated or finished goods | Always tarped or wrapped |
Tarp surcharges range from $50–$200 depending on load configuration and whether the driver tarps or a lumper does. When tarping is required, confirm it's included in the carrier quote before committing a rate to the shipper.
When Flatbed Is the Wrong Call
Flatbed has limits. If any of the following are true, the load likely needs different equipment.
- Freight height exceeds 8'6" — step deck or double drop is needed
- Freight requires a weathertight enclosure — consider conestoga or van
- Freight width exceeds 8'6" — oversize permit load, different quoting process
- Load requires loading dock access — flatbed loads from the side or top only
- Freight is palletized standard-height dry goods — a dry van is cheaper and more available
Broker Checklist Before Quoting Flatbed
- Get the freight dimensions: L × W × H in inches and total weight in lbs
- Confirm loading method: forklift, crane, overhead? Some flatbed carriers don't carry chains or have height restrictions
- Ask whether tarping is required and who's responsible for tarping
- Check if the load is coil — coil requires a cradle or coil rack which not every carrier runs
- Verify whether a team driver is needed for the transit time
- Confirm pickup and delivery are forklift/crane accessible (flatbed cannot back to a dock)
FreightLeads Pro
Carrier compliance built into every rate con
Live FMCSA authority and insurance check on every rate confirmation. If a carrier fails, the document locks — not a warning, a hard stop. Plus lead finder, dispatch, and invoicing in one place.
Start Free 14-Day Trial →No credit card required