Trailer Types & Load Classes: What Ships on What
Last reviewed September 2026
Two questions decide almost everything about a heavy move: which trailer does the load physically need, and which legal class does it fall into. Get those two right and the rest, permits, escorts, price, follows automatically. Here is the working map, the same one a dispatcher runs in their head.
Hotshot: the fast, light end
A hotshot is a heavy-duty pickup pulling a 30 to 40 ft gooseneck trailer. It shines for single smaller machines, a skid steer, a mini excavator, a compact tractor, and urgent partial loads that cannot wait for a full truck. The practical ceiling is modest: keep the load roughly inside 15,000 to 18,000 lb and normal legal dimensions and a hotshot is often the quickest, cheapest truck to your door. It is speed and economy for small iron, not a home for anything wide or heavy.
Flatbed: the workhorse deck
The standard flatbed is a 48 or 53 ft open deck standing roughly 5 ft off the road. It carries the broad middle of freight: palletized machinery, steel, lumber, crated equipment, vehicles, anything that fits in legal height once you add the deck underneath it. Because the deck is high, a load taller than about 8.5 ft starts flirting with the height limit, and that is the moment to look one step down, literally.
Step deck: the same deck, dropped
A step deck (drop deck) lowers most of its deck to roughly 3.5 ft, buying about a foot and a half of load height over a flatbed. Mid-size excavators, wheel loaders, forklifts, taller crates: things that would be over-height on a flatbed often ride legal on a step deck. It is the default answer for equipment that is heavy and a bit tall but not extreme, and many moves that people assume need special permits simply need this trailer instead.
RGN and lowboy: when big iron rolls on
A removable gooseneck (RGN) detaches at the front so the trailer becomes its own ramp: tracked and wheeled machines drive on under their own power. Its well sits about 18 to 24 inches off the road, which is what lets a 10 or 11 ft tall dozer, excavator, or crane travel inside, or close to, legal height. Lowboys carry the same idea for the heaviest pieces, and both stretch with additional axles as weight grows: 3 axles for the mid-40,000s of pounds, and multi-axle configurations far beyond. If it is tall, heavy, and moves under its own power, this is its trailer.
The legal ladder: legal, oversize, superload
Class one is the legal load: inside roughly 8.5 ft wide, the state's height limit, and 80,000 lb gross in the US, no permit, moves any hour any day. Class two is the permitted oversize or overweight load: beyond the envelope but within routine permit ceilings, moving with permits, marking, escorts by band, and daylight-type windows. Class three is the superload: dimensions or weight past routine ceilings, where jurisdictions demand engineering review, route surveys, sometimes police escorts and utility crews, and the timetable belongs to the authority, not the shipper. Each step up costs more and moves slower; the trick is knowing which step your load truly stands on.
The loads nobody moves whole
Some pieces are past even superload practicality, and one rule decides it: divisibility. Permits exist for loads that CANNOT reasonably be reduced; if a load can be broken down, authorities expect it broken down rather than permitted. In practice, booms come off cranes, counterweights ship separately, buckets and attachments ride beside the machine, and oversize projects become several ordinary trucks plus one permitted one. When something truly cannot shrink below what roads, bridges, and wires can accept, the answer stops being a truck at all and becomes engineered transport: multi-jurisdiction superload programs, or rail and barge for part of the journey. Declaring attachments honestly at quote time is exactly how this gets planned instead of discovered.
Axle groups, in plain words
Weight law counts axles because pavement feels pounds per contact point, not totals. A single axle carries the least, a tandem (two axles close together) more, a tridem (three) more again, and specialized trailers add axles precisely to spread weight until it is legal or permittable. That is why the same 60,000 lb machine can be an overweight problem on one trailer and a routine move on another with more axles under it, and why your quote asks for real weight: the axle math is the price.
Shipping something that needs all this handled?
Enter true dimensions and the quote engine prices permits and escorts along your actual route, locked for 30 days.
Get an instant quote →Common questions
How do I know which trailer my machine needs?▾
Height and drivability decide most cases: fits under legal height on a 5 ft deck, flatbed; needs an extra foot and a half, step deck; tall and drives or rolls, RGN or lowboy; small and urgent, hotshot. Our quote engine makes the same call from your dimensions and prices the right trailer automatically.
Is a superload just a bigger oversize load?▾
Legally yes, practically no: superloads cross into engineering review, route surveys, and authority-controlled scheduling, which changes cost and timeline in kind, not just degree. The thresholds vary by jurisdiction; the state and province guides on this site list them as they are verified.
Why does removing the bucket change my price so much?▾
Because the bucket is often what pushes width or weight over a permit or escort band. Attachments ride cheaper beside the machine than on it, and honest attachment dimensions at quote time let the engine choose the cheaper legal configuration.
Can LoadLoom handle superloads?▾
Yes: the quote engine prices to super-load class dimensions, and beyond routine bands our dispatch desk plans the move with the issuing authorities. Truly non-reducible extreme pieces get an engineered plan rather than a guess.
This guide is provided free, for general information, so shippers can see how oversize and overweight moves work. It is not legal advice and not a permit determination. Limits, escort bands, fees, and seasonal restrictions change regularly; before relying on any figure, verify it with the jurisdiction's transportation department or permit office, or a licensed permit service. When you book with LoadLoom, our dispatch desk and your assigned carrier confirm the current rules for your exact load and route; that confirmation, not this page, governs your shipment. Spot an error? Email customercare@loadloom.com.