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Open deck freight — steel, lumber, machinery, construction equipment — doesn't always fit on a standard flatbed. Here's how to know which trailer your load actually needs.
A standard flatbed is a 48 or 53-foot trailer with no sides, no roof, and a deck height of approximately 58–60 inches from the ground. Legal load height with freight is 13'6" maximum in most states.
Best for: Steel coils, lumber, pipe, building materials, equipment under 13'6" tall. Any load that's too long, wide, or heavy for an enclosed trailer but fits within standard height limits.
A step deck has two deck levels — a shorter upper deck at the front and a lower main deck that "steps down" behind the front axles. The lower deck sits at approximately 36–40 inches from the ground, giving you ~10 extra inches of usable height compared to a flatbed.
Best for: Construction equipment, agricultural machinery, large vehicles, freight that's 10–11 feet tall. If your load is between 8'6" and 10' tall, a step deck is often the right call.
| Question | If Yes → Use |
|---|---|
| Is freight under 8'6" tall? | Standard Flatbed |
| Is freight 8'6"–10' tall? | Step Deck |
| Is freight over 10' tall? | RGN or Permit Load |
| Does freight need to roll on/off? | RGN (detachable neck) |
| Is freight over 48,000 lbs? | RGN or Multi-Axle |
Step decks typically run 8–15% higher than standard flatbeds due to lower equipment availability. RGN loads cost significantly more and often require permits. If your freight is borderline on height, measure carefully — a few inches can save you significant money by staying on a standard flatbed.
Both flatbed and step deck loads must comply with FMCSA cargo securement regulations. Steel requires blocking and bracing. Machinery requires chains and binders. All loads need edge protection where straps contact freight. Your broker should confirm the carrier has the correct securement equipment before dispatch.
IZY Logistics is a licensed freight broker (MC #1615290) serving shippers across the United States. Get a competitive quote in under 30 seconds.
Get a Free Quote →Not always — it depends on the shipment. flatbed and step deck each fit different freight profiles, and the right choice usually comes down to cost, timeline, and equipment fit rather than one being universally better.
Yes. Many shippers use flatbed for some freight and step deck for other freight in the same month, matching the option to each shipment's specific needs rather than committing to one exclusively.
A freight broker who handles both flatbed and step deck can review your shipment details and recommend the better fit — that's part of what IZY Logistics does for shippers who aren't sure.
Yes, cost is usually one of the biggest differences between flatbed and step deck, alongside transit time and how the freight needs to be handled.
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