Moving Heavy Machinery Across the United States
A heavy haul move is decided by three numbers before anything else: weight, width and height. Get those right and the rest is scheduling. Get any of them wrong and you discover it when a permit is refused, a bridge is posted lower than expected, or a driver arrives with the wrong trailer.
The Legal Limits Everything Works Around
Federal limits on the Interstate system are 8 feet 6 inches wide, 13 feet 6 inches tall, and 80,000 pounds gross with 20,000 on a single axle and 34,000 on a tandem. Some states allow more height on their own highways.
Height is the one that catches people, because it includes the trailer. A flatbed deck sits around 5 feet off the road, so a 9 foot machine is already at 14 feet before anybody measures the cab. That single fact explains most of what follows.
Weight has a second layer. The federal bridge formula limits how much can sit within a given axle spacing regardless of whether the gross figure is legal, which is why a machine under 80,000 pounds can still need more axles than you expect.
The Trailer Follows the Machine
A flatbed handles smaller equipment: skid steers, mini excavators, attachments, anything where combined height stays comfortably legal.
A step deck drops the rear section about a foot and covers most mid size machines. It is the workhorse of equipment transport and it is frequently the difference between a permitted load and a legal one.
A lowboy or removable gooseneck drops the deck to around 18 to 24 inches, which is what gets a large excavator, dozer or crane under a bridge legally. The removable gooseneck earns its keep in a specific way: the front detaches so the machine drives on at ground level rather than climbing ramps, which matters for a long, low tracked machine.
Beyond that sit multi axle and stretch configurations for genuinely heavy or long loads, and those are engineered per job rather than picked from a list.
Permits, Escorts and Route Surveys
Past any legal limit the load needs an oversize or overweight permit from every state it crosses, issued against a specific machine, configuration and route.
Routine permits are normally issued quickly. Multi state moves take longer because each state issues its own and their rules do not match, which is the single most common reason a heavy haul schedule slips.
Wider loads bring escort vehicles into it, with thresholds that vary by state and by road type, and the largest loads require engineering review of bridges and structures on the route. Movement is generally daylight only on weekdays with holiday restrictions, so a permitted load covers far less ground per day than an ordinary truck.
For anything genuinely large, a route survey is not an optional extra. A single posted bridge on the only sensible road can redirect a move by hundreds of miles.
Get the Numbers From the Machine, Not the Brochure
Give an accurate weight from the manufacturer’s specification or a certified scale, and include everything traveling with it.
Counterweights, attachments, full fuel and hydraulic tanks and fluid filled tires all add weight that is invisible from outside. On a large machine that can be thousands of pounds, and it is the difference between a legal load and a citation.
Measure width and height as the machine actually stands. Wide track pads, aftermarket fittings and a raised cab all change the figures, and the brochure assumes a standard configuration nobody is running.
Reduce the Envelope Before You Book
This is where the money is, and it is routinely overlooked.
Removing a bucket, folding an arm, taking off a header, lowering a boom or swapping wide pads for standard ones can bring a load under a threshold. Crossing back inside the legal envelope removes the permit, the escorts and the daylight-only restriction together, and twenty minutes of work in the yard frequently saves more than the labor costs several times over.
It is worth asking the carrier directly what dimension is driving the cost, because the answer sometimes points at something you can change.
What Drives the Price
Distance and weight set the base. After that the cost moves with things that are mostly visible before you book.
The trailer type is the first step change: a flatbed load and a lowboy load are not in the same bracket, and multi axle configurations more again. Whether the load needs permits is the second, and it compounds, because permits bring escorts, escorts bring daylight-only movement, and daylight-only movement stretches a two day run into four.
The number of states crossed matters for the same reason. Each issues its own permit on its own timetable, and a route through six states is six processes rather than one.
Seasonality is real. Construction demand peaks through the warmer months and lowboy capacity tightens with it, so the same move booked in February and in June is not the same price. Anything with a fixed deadline deserves more lead time than you think it needs.
Preparing the Machine and the Site
Clean the tracks and undercarriage properly. Carried soil is weight you are paying to haul, it falls onto the highway in transit, and several states treat it as a violation.
Secure or remove loose items, check for leaks, and lower attachments onto the deck. Photograph the machine in daylight from every side including the undercarriage, the glass and the hour meter, and get existing damage described specifically on the bill of lading rather than as general wear.
The site matters as much as the machine. A tractor with a lowboy needs firm ground, room to turn and space to load, and soft ground is the usual obstacle because a loaded trailer sinks where a tracked machine walks across. Low branches, gates, overhead lines and whether the loading area is level all belong in the conversation before the day. Our guide to wide and oversize loads covers the permit rules in detail.
Common Questions
What triggers a permit? Past 8 feet 6 inches wide, past the applicable height limit, or over 80,000 pounds gross or any axle limit.
Why does height matter so much? Because it includes the trailer. A 9 foot machine on a 5 foot deck is already at the legal ceiling before the cab is measured.
Can I lower the cost? Frequently. Removing an attachment or swapping pads can bring a load inside the legal envelope and remove permits and escorts entirely.
Do I need a route survey? For anything genuinely large, yes. A single posted bridge can redirect a move by hundreds of miles.
How far ahead should I book? A week or two for a standard move, longer for anything permitted or during the summer construction peak.
Get a Quote
Call Ship A Car, Inc. at (866) 452-3657 for heavy haul and specialized freight with the machine’s make and model, its operating weight, its measured width and height, and the access at both sites, or price it with the specialized transport calculator.
