Trailers Buyer Guide

• Used commercial tag and deck-over trailers typically range from $12,000 to $35,000, while commercial RGN lowboys and multi-axle heavy-haul trailers command $40,000 to $130,000+ depending on axle count and tonnage.
• Gross Vehicle Weight Ratings (GVWR) generally span from 14,000 lbs on light equipment pull-alongs to over 120,000 lbs on 55-ton commercial lowboys.
• Service life expectancy routinely exceeds 15 to 25 years or 750,000+ road miles when structural crossmembers and suspension hangers are shielded from corrosion.
• Trailers lack drive engines, but self-contained hydraulic pony motors (typically 11-13 HP gas or diesel engines) burn approximately 0.5 to 1.0 gallon of fuel per operational hour.
• Common configurations include hydraulic detachable goosenecks (RGN), mechanical folding goosenecks, beavertails with spring or hydraulic ramps, outriggers, and flip-axle attachments.
• Primary operational uses focus on transporting excavators, dozers, wheel loaders, directional drills, and road-milling equipment between job sites.

• 1Inspect main beam bottom flanges and gooseneck transition gussets for hairline cracks, flaking paint signaling steel stress, or downward sag.
• 2Examine crossmembers and junior I-beams directly above the suspension hangers and rear trunnion for severe rust scaling, salt pitting, and cracked weld connections.
• 3Measure kingpin wear with a dedicated gauge for excessive circular grooving, and check the upper coupler fifth-wheel plate for dishing, warping, or crack propagation.
• 4On hydraulic detachable goosenecks, check hydraulic cylinders, lock pins, and support tower pivot points for cylinder scoring, hydraulic weepage, and elongated pin-boss holes.
• 5Evaluate brake shoe lining thickness, S-cam bushings, slack adjuster stroke travel, and listen for audible air-line leaks through the brake valves under loaded pressure.
• 6Inspect suspension components, verifying air spring bags show no dry rot or rubbing, torque arms are intact, and leaf spring hanger brackets are free of structural cracking.
• 7Review tire wear across all axles, checking for cupping or shoulder wear which indicates axle misalignment, bent spindles, or failed wheel bearings.
• 8Check the condition of the deck, whether apitong hardwood, oak, or steel traction plate, accounting for split planks, rot, or bowed sections that add replacement costs.
• 9Verify the integrity of sealed harness wiring, junction boxes, and ABS diagnostic light operation to avoid costly roadside electrical repair citations.

Commonly-reported issues from operators and technicians. Every machine varies — always inspect before you buy.