Buying Your First Lowboy: RGN or Fixed-Neck, How Many Axles, and What It Changes About Your Bids
By Brent Christiansen · Published
Every excavation contractor reaches the same moment: the heavy hauler's invoices for the month add up to a trailer payment, and the excavator sat two days waiting for a ride. Buying a lowboy is how the iron starts moving on your schedule instead of someone else's. Here's how to choose one, what to check on a used one, and how the financing works when the tractor comes with it.
RGN or fixed-neck
A removable-gooseneck (RGN) lowboy detaches at the front so the machine drives on and off from the ground. It's the standard for excavators, dozers and anything that shouldn't climb a ramp. Hydraulic RGNs raise and lower with their own power pack; mechanical RGNs use the tractor and a bit of ceremony, and cost less. A fixed-neck lowboy loads from the rear over ramps or a beavertail: lighter, cheaper, fine for a mid-size machine that can climb, wrong for a 40-ton excavator.
The honest rule: buy the neck for the biggest machine you'll actually haul in the next three years, not the biggest one you can imagine.
How many axles
Capacity and legal weight decide it. A two-axle lowboy handles the compact and mid-size iron. A three-axle handles most excavators and dozers a contractor owns. Add a flip axle, and the same trailer becomes a 3+1 that's permit-ready for heavier loads; add a jeep dolly in front and a booster behind and you're into 3+2 and beyond, which is heavy-haul territory with its own permits and its own tractor.
State weight laws set the real answer. A trailer that's legal in one state at a given load needs a permit in the next, and the routes you run decide whether the flip axle is a nice-to-have or a necessity.
What it changes about your bids
The obvious saving is the hauler's invoice. The bigger one is time: the machine that used to wait for a ride is on the next site the same afternoon, and a crew that used to stand around is working. Contractors who buy a lowboy usually find they bid jobs they used to pass on, because moving the iron stopped being the hard part. That's the number to put against the payment, not just the invoices you'll stop paying.
Used-lowboy checklist
A lowboy carries the heaviest loads on the road, and the frame is the whole trailer. Before you agree on a price:
- Main beams and cross-members: cracks, previous weld repairs, and sag between the neck and the axles. Sight down the deck.
- The neck: hydraulic cylinders, hoses and pump on an RGN; pin and latch on a mechanical neck; kingpin wear.
- Suspension and axles: air bags and leveling valves or spring hangers, alignment, bearing play.
- Brakes, drums and ABS, with a current DOT annual inspection in hand.
- Tires, matched and dated. Eight or twelve tires is a real number on the price.
- Deck boards, tie-down points, ramps and outriggers, and whether the flip axle, jeep or booster in the listing is actually included, with complete wiring and air lines.
How the financing runs
A lowboy is often bought with the tractor that pulls it, especially the first one. At Avanti the two are financed as one deal, one application and one payment, and the combined ticket usually clears the app-only program with no tax returns. A lowboy bought on its own is financed on its own, new or used, from a dealer or a private seller. A multi-axle heavy-haul package with jeep and booster, or a trailer-and-tractor combination, can run past $300,000, where the deal is structured with a financial package and a term matched to the work.
Every credit profile is considered. Strong credit can mean $0 down; challenged credit usually means a down payment and a newer trailer, and equipment you already own, the excavator the lowboy will carry, for instance, can be pledged to lower the cash at closing. Get pre-qualified before you shop; the number takes about three minutes and comes back in as little as 24 hours.
Financing covered in this article
- Lowboy & heavy-haul trailer financingRGN and fixed-neck lowboys, jeeps and boosters, alone or as one deal with the tractor.
- Dump truck financingSingle-axle through tri-axle dump trucks for contractors and haulers.
- Collateral-based financingWhen the equipment carries the deal instead of the credit score.
Common questions
Should I buy an RGN or a fixed-neck lowboy?
An RGN detaches at the front so the machine drives on from the ground, which is the standard for excavators, dozers and anything that shouldn't climb a ramp. A fixed-neck loads from the rear over ramps, costs less and weighs less, and suits mid-size machines that can climb. Buy the neck for the biggest machine you'll actually haul in the next three years.
Can I finance a lowboy and the tractor together?
Yes. A trailer and tractor bought at the same time are financed as one deal with one application and one payment, and the combined ticket usually fits an app-only program with no tax returns. A lowboy bought on its own is financed on its own.
What should I check on a used lowboy?
Main beams and cross-members for cracks, weld repairs and sag; the neck hydraulics or pin and latch; kingpin wear; suspension, axles, brakes and ABS with a current DOT inspection; matched and dated tires; and whether any flip axle, jeep or booster in the listing is actually included with complete wiring and air lines.
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