Lowboy Trailers for Sale - New & Used RGN Lowboys

Lowboy Buyer's Guide & Specs

If you're hauling tall iron, a lowboy (double-drop) keeps the deck down in the well so you clear bridges without stacking permits. Most fleets standardize on a 50–55-ton hydraulic RGN with a 48–53 ft overall length and a well that fits their most common machine. From there you add a flip or a booster when the job calls for it.

Capacity & weight planning

• 35-ton: smaller dozers, wheel loaders, and rollers.
• 50–55-ton: mid-size excavators and heavier machines (most common choice).
• Beyond 55-ton: plan axle additions (flip/booster) or a jeep/dolly based on your corridors and bridge laws.

Length, deck height & well

Overall length (48–53 ft) is easy to shop, but the well length and deck height are what make loads fit cleanly. Match well length to the machine's track/wheel base and check loaded deck height against the machine's transport height. If the tracks sit wide, go with outriggers or swing-outs.

Neck type & loading

Hydraulic detach saves time and headaches loading on uneven sites. Mechanical detach keeps weight and cost down for fleets that don't need to drop the neck as often. Either way, make sure your crew has a repeatable rigging process—pins, hoses, and locking hardware should be quick to inspect and service.

Axles, flips & boosters

Tandem and tri handle the bulk of work. Add a flip axle when you occasionally run heavier; use a booster when you need to spread loads and meet bridge formulas. Your permits and usual states will dictate what makes sense.

Suspension & floor

Air ride is easiest on machines and operators; spring is simple and tough. Apitong/wood floors are common and repairable; steel decking stands up to point loads and track shoes. Spec chain drops, D-rings, lights, and toolboxes to match how your crew actually ties down.

Used lowboy checklist

• Neck pins, saddles, hinge points—look for elongation and cracking.
• Main beams, cross-members, and gussets—rust at welds, evidence of bowing.
• Air system, valves, and tanks—leaks and contamination.
• Suspension bushings, brakes, drums/rotors, hub oil, and lights.
• Flip/booster hardware and plumbing—treat it like a separate machine.

Pricing on this page updates from active listings. Today's typical list prices cluster around $39,900–$113,000 with a median near $68,900. Most units listed are 53 ft overall, with 35-ton and 55-ton capacities the most common.