Freight Trailer Types: A Shipper’s Guide to Choosing the Right Equipment
Most guides on trailer types read like a catalog. Here’s a dry van, here’s a reefer, here’s a flatbed, call us.
That’s fine if all you needed was vocabulary.
But if you’re the one responsible for the freight, the real question is which trailer is right for THIS shipment. And the answer decides more than you’d think… your rate, your transit time, how many carriers can even haul it, and whether your load gets rejected at the dock because someone guessed wrong on equipment.
I’ve been booking freight for over 10 years, and I run Booker Freight, an independent brokerage. Equipment selection is one of the first things I work through on every single quote. So this guide covers the equipment the way I’d explain it to a customer, with the specs that actually matter and the judgment calls the spec sheets don’t tell you.
Dry Van: The Default for a Reason
The 53-foot dry van is the workhorse of American freight. Enclosed, weatherproof, loads from the rear at a dock.
The numbers: 53′ long, roughly 100″ wide and 110″ high inside, up to about 44,000–45,000 lbs of freight, 26 standard pallet positions.
If your freight is palletized, boxed, or shrink-wrapped and doesn’t need temperature control, this is almost always your answer. Dry vans also have the deepest carrier pool of any equipment type, which means more competition for your load and better pricing.
What the catalogs won’t tell you: “dry van” isn’t one thing. There are food-grade vans, vans with e-track and load bars, plated vans with a little extra interior width, vented vans. If your commodity needs a swept-out, odor-free trailer (food, paper, packaging), say so up front. A van that hauled scrap metal yesterday can pass every inspection and still be the wrong van for your freight.
Also worth knowing: weight is usually the constraint before space is. A 53′ van can cube out at 26 pallets or gross out at 44,000 lbs, and heavy product hits the weight ceiling long before the walls.
Reefer (Refrigerated Trailer): More Than Frozen Food
A reefer is a dry van with insulated walls and a refrigeration unit that can hold a set temperature, typically anywhere from about -20°F to 70°F.
The numbers: 53′ long, slightly tighter inside than a dry van because of the insulation (figure around 43,500–44,000 lbs max and a bit less height), still 26 pallet positions in most configurations.
Obvious uses: produce, meat, dairy, frozen food, pharmaceuticals.
Less obvious uses: reefers running “protect from freeze” in the winter for things like beverages, paint, chemicals, and canned goods. If your product can’t sit in a trailer at -10°F crossing Wyoming in January, you have reefer freight for part of the year even if you’ve never thought of it that way.
One judgment call I make constantly: continuous vs. cycle mode on the unit. Continuous holds a tighter temp and matters for sensitive product like produce and pharma. Cycle saves the carrier fuel. If nobody specifies, the driver decides. On your freight, I’d rather it be specified.
Flatbed: When the Freight Won’t Fit in a Box
Open deck, no walls, no roof. Loads from the sides, from above with a crane, or with a forklift from any angle.
The numbers: 48′ is most common (53′ exists), 102″ wide, 48,000 lbs, and freight can stand up to 8’6″ tall and still be legal height.
This is your equipment for steel, lumber, machinery, building materials, pipe… anything that gets loaded by crane or forklift and doesn’t need to be enclosed.
The detail that separates a smooth flatbed shipment from a mess is securement. Tarps, chains, straps, coil racks, dunnage. If your freight needs tarps, that’s a specific ask (lumber tarps and steel tarps are different sizes), it adds to the rate, and not every flatbed carrier hauls tarped freight. Tell your broker before the truck shows up, not after.
Step Deck (Drop Deck): For Freight That’s Too Tall
A step deck is a flatbed with a lower main deck, which buys you roughly two extra feet of freight height.
The numbers: 48’–53′ total length with a short upper deck over the axles, and the lower deck takes freight up to about 10’2″–10’6″ tall. Capacity in the 45,000–48,000 lb range.
If your freight is between 8’6″ and about 10’6″ tall, this is the equipment that keeps you legal without permits. Forklifts, small excavators, tanks, crated equipment… a huge amount of “slightly too tall for a flatbed” freight lives here.
Height is the mistake I see most on this equipment. A shipper measures the machine but forgets the blocking under it, or measures to the frame instead of the highest point. Two inches on paper can turn a legal load into a permit load at pickup. Measure to the tallest point, then measure again.
Double Drop and Lowboy: The Really Tall Stuff
When freight is taller than a step deck can legally carry, the deck has to get closer to the ground. A double drop has a “well” in the middle that rides low; a lowboy is the heavy-haul version of the same idea.
The numbers: the well is usually 25’–29′ long, and freight can run 11’6″–12′ tall and still move legally. Legal weight is around 40,000 lbs, but with multi-axle configurations and permits, lowboys and RGNs handle far more.
RGN (Removable Gooseneck): For Equipment That Drives Itself On
An RGN is a lowboy where the front detaches, so the trailer becomes its own ramp. That’s the equipment for dozers, excavators, and anything self-propelled.
The numbers: roughly 42,000 lbs legal, with permitted heavy-haul configurations going well beyond that as axles get added. Extendable RGNs stretch for extra-long freight.
Once you’re in double drop / RGN territory, you’re often in oversize/overweight territory too, which means permits, sometimes escorts, restricted travel times, and a much smaller carrier pool. Lead time matters here. This is not the freight to shop the morning it ships.
Conestoga and Curtainside: Flatbed Freedom, Dry Van Protection
A Conestoga is a flatbed (or step deck) with a rolling tarp system, and a curtainside is a van with sliding fabric walls. Both give you side loading with full weather protection, no manual tarping.
The numbers: 48’–53′, around 42,000–44,000 lbs, with slightly reduced usable width and height because the tarp system takes up space.
These shine for freight that needs crane or side loading but can’t get wet or can’t be tarped by hand without damage… machinery with sensitive finishes, some building products, staged construction freight. Fewer of them exist, so expect a premium over a standard flatbed and a little more lead time.
Hotshot, Sprinter Van, Box Truck: The Small and Fast Lane
Not every shipment needs 53 feet.
Hotshot: a heavy-duty pickup pulling a 30’–40′ gooseneck trailer, good for up to roughly 16,500 lbs of open-deck freight. Great for 1–2 machines or a partial flatbed load that needs to move NOW without paying for a full trailer.
Sprinter/cargo van: 1–3 pallets, up to about 3,000 lbs, and the go-to for expedited freight because it’s one driver, one shipment, no other stops.
Box truck (straight truck): 12’–26′ box, up to around 10,000–12,000 lbs, and often the answer when the delivery is a job site or storefront with no dock (add a liftgate and you’ve solved the “how does it get off the truck” problem).
Small equipment gets treated like an afterthought, but expedited and final-mile shipments are usually the ones with the least room for error. The freight is small because it’s urgent.
Quick Reference: Trailer Specs at a Glance
| Equipment | Typical Length | Max Freight Weight | Max Freight Height | Best For |
|---|---|---|---|---|
| Dry van | 53′ | ~44,000–45,000 lbs | ~110″ interior | Palletized/boxed freight |
| Reefer | 53′ | ~43,500 lbs | ~103″ interior | Temp-controlled + protect-from-freeze |
| Flatbed | 48’–53′ | ~48,000 lbs | 8’6″ | Steel, lumber, machinery |
| Step deck | 48’–53′ | ~45,000–48,000 lbs | ~10’2″–10’6″ | Tall equipment, no permits |
| Double drop / lowboy | well 25’–29′ | ~40,000 lbs legal (more permitted) | ~11’6″–12′ | Very tall/heavy machinery |
| RGN | 48’+ (extendable) | ~42,000 lbs legal (more permitted) | ~11’6″ | Self-propelled equipment |
| Conestoga / curtainside | 48’–53′ | ~42,000–44,000 lbs | slightly under flatbed specs | Side-load freight needing protection |
| Hotshot | 30’–40′ | ~16,500 lbs | ~9’6″–10′ | Small, urgent open-deck loads |
| Sprinter van | 1–3 pallets | ~3,000 lbs | n/a | Expedited small freight |
| Box truck | 12’–26′ | ~10,000–12,000 lbs | n/a | No-dock deliveries, liftgate work |
(These are typical ranges. Real capacity depends on the specific trailer, the tractor, and how the load sits over the axles, which is exactly the kind of thing worth confirming before you tender.)
How I Actually Pick Equipment for a Customer’s Freight
When you request a quote from me, the equipment conversation is usually five questions:
- What’s the commodity? Not just “machinery.” What is it, what’s it worth, and what happens if it’s late or damaged?
- Dimensions and weight, measured, not guessed. Length, width, height to the highest point, and actual weight with packaging and blocking.
- How does it load and unload? Dock, forklift, crane, ramp? Both ends matter, and the delivery site is where surprises live.
- Does it need protection? From weather, from temperature, from freeze, from the trailer’s last load?
- When does it really need to be there? Because the honest answer changes whether we’re talking dry van, hotshot, or a team.
Sometimes the right answer is the cheaper one. I’ve told customers to skip the reefer because blankets and a dry van would protect their product fine that week. A broker who knows equipment should be finding you the RIGHT trailer at a rate that reflects what the load actually requires… and should be able to explain why.
Not Sure What Your Freight Needs? Ask.
If you’re staring at a shipment and you’re not 100% sure whether it’s a step deck or a permit load, or whether your product needs protect-from-freeze service this winter… that’s exactly the conversation I’m here for. No pressure, no pitch deck.
Send me the commodity, dims, weight, and the lane, and I’ll come back with the right equipment and a real quote.
📧 krystina@bookerfreight.com 📞 423-596-2000
