Low-clearance equipment is the phrase renters use when their machine sits low enough that a normal trailer ramp becomes a real problem. The moment you push a scissor lift, a lowered sports car, a compact portable generator on a pallet, or a low-slung zero-turn up a standard 22-inch-deck trailer, something scrapes. The bumper. The exhaust. The front spoiler. The bottom of the deck. You end up either backing off, breaking out plywood shims, or ratcheting up a winch on a machine that doesn't run. This guide walks through the approach angle math so you can predict whether your load has a problem, which types of equipment reliably need a low-loading trailer, and where a ground-load Air Tow fits versus a tilt deckover.
The Approach Angle Math
Every trailer with a fixed ramp has an approach angle you can calculate. Take the trailer deck height (typically 22 inches on a car hauler, 30-34 inches on a deckover) and the horizontal ramp run (usually 48 inches on utility trailers, 60-72 inches on car haulers). Divide, arctan it, and you have your approach angle:
- 22" deck, 48" ramp: roughly 24-degree approach angle. Nothing low is loading on this without scraping.
- 22" deck, 60" ramp: around 20 degrees. Still steep for anything under 6" of clearance.
- 22" deck, 72" ramp: around 17 degrees. Reasonable for most cars but still too steep for a lowered sports car or a low-mounted scissor lift.
- Tilt deckover: roughly 8-11 degrees depending on the trailer length. Solid.
- Air Tow (ground load): zero degrees. Deck sits flat on the ground.
Now compare that to your machine's approach angle. Most cars publish this spec — stock trucks are usually 20-30 degrees, sports cars are 10-14 degrees, and lowered vehicles can be as low as 5-7. If your machine's approach angle is less than the ramp's, it will scrape. It's that simple.
Which Equipment Types Consistently Need Low Loading
Scissor Lifts
Compact scissor lifts — Genie GS-1930, JLG 1930ES, Skyjack SJIII 3219 — have platform decks that sit 6-8 inches off the ground when stowed. Standard car-hauler ramps drag or high-center them every time. Air Tow eliminates the issue.
Sports Cars and Project Cars
Corvettes, Porsches, Mustangs with lip kits, Miata track builds, anything lowered on coilovers, non-running project cars with flat tires. The tilt deckover is the standard answer here, though the Air Tow works for anything that clears the 8.5-foot trailer width.
Low-Deck Zero-Turn Mowers
Commercial zero-turns with 60" or 72" decks set to a low cutting height (2-2.5") drag the deck on standard ramps. Details in the zero-turn mower guide. Air Tow is the fix.
Portable Generators on Pallets
Trade-show and rental-yard portable generators (12kW-25kW range) are often mounted on 42"x48" pallets. A pallet jack won't climb a ramp. A forklift can, but you still need a low deck. Air Tow lets a pallet jack push straight on.
Compressors, Welders, and Trade Equipment
Same story — shop equipment on casters or pallets that a pallet jack has to move. Ground load is the only practical option.
Golf Carts and Utility Carts
Covered in detail on the golf cart guide. Hard tires and weak brakes make ramps risky, ground load is easier.
Quick check: if your machine's ground clearance is under 6 inches, or its published approach angle is under 15 degrees, do not load it on a standard car hauler. Pick the Air Tow or the tilt deckover.
Air Tow vs. Tilt Deckover for Low Clearance
Both trailers solve the ramp-angle problem, but they solve it differently.
Air Tow
Air suspension drops the deck to ground level. Approach angle is zero. Payload up to 9,885 lbs, GVWR 13,535 lbs, deck around 6.5x14 feet. Best for compact and mid-size equipment — golf carts, single mowers, single scissor lifts, single non-running vehicles, pallet loads.
Tilt Deckover
Hydraulic tilt drops the tail of the deck to ground level while the front stays elevated. Approach angle around 8-11 degrees. Payload around 10,000 lbs, GVWR 14,000 lbs, deck 8.5x24 feet. Best for larger equipment, longer loads, multiple items, or anything that needs deck width (skid steers, mini-ex, wide equipment). See the tilt deckover guide.
Which One for You
- One low machine, under 6.5' wide, under 9,000 lbs: Air Tow. Faster to load and cheaper for short jobs.
- Larger, wider, or multiple loads: Tilt deckover.
- Anything that must arrive dry: Enclosed cargo trailer instead — not a low-clearance solution, but rain-safe.
Tow Vehicle and Pricing
Both trailers need a 2 5/16" ball, 7-way plug, and a working brake controller. Air Tow at 13,535 lb GVWR wants a half-ton pickup minimum; tilt deckover with a heavy load wants a 3/4-ton or 1-ton.
- Air Tow: $250 / 4 hr, $300 / 24 hr, $720 / 3 days, $1,260 / week
- Tilt Deckover: $120 / 4 hr, $140 / 24 hr, $355 / 3 days, $735 / week
Pickup at W4637 Lakepark Drive, Fond du Lac, WI. No mileage limits. Text Nick at (920) 381-9770 with your equipment specs and dates.
FAQ
How do I know if my equipment is "low clearance"?
Measure from the lowest fixed point on the machine (frame, exhaust, spoiler, deck) to the ground. Under 6 inches counts as low clearance. Under 4 inches and you almost certainly need a ground load.
Can I use a longer ramp to fix the angle?
A longer ramp helps, but ramp length is limited by strength — an 8-foot ramp needs serious support to handle heavy loads without flexing in the middle. That's why manufacturer ramps top out around 6 feet on car haulers. For genuinely low equipment, a longer ramp isn't enough.
What about plywood shims or wooden ramps?
They work for lightweight loads at low speed but they're not a real solution for heavy or expensive equipment. They can crack, split, or slip. If you're moving a $30,000 sports car or a $12,000 lift, the right trailer is cheaper than one bad loading incident.
Do I need a winch to load a non-runner?
On the Air Tow, no — a couple of helpers can push a non-runner onto a flat ground-level deck. On the tilt deckover, we include a wireless-remote electric winch for exactly this reason.
Can you tell me which trailer to pick?
Text or call. Send Nick the make, model, ground clearance, and dimensions, and he'll confirm. Getting it right the first time saves a return trip.
Does the Air Tow suspension work in cold weather?
Yes. The air system is rated for Wisconsin winters. In extreme cold the deck lowers slightly slower but it operates reliably year-round.
Can I use my own straps and chains?
Sure. The trailer comes fully equipped, but you're welcome to bring your own if you have gear you trust. The rental includes wheel nets, ratchet straps, and chains rated for the trailer's GVWR.