Used Dolly Trailers For Sale

Used dolly trailers, often called converter dollies, are built to connect a lead trailer to a second trailer in doubles service. The core job is simple: provide a steerable or fixed connection point with a fifth wheel, axle, suspension, brakes, and drawbar assembly that can handle repeated coupling cycles and highway miles. Most used units on the market are single-axle steel converter dollies with air brakes, spring ride suspension, and 22.5-inch wheels. Common GVWR ratings are around 20,000 pounds, with empty weights often in the 2,800-pound range depending on frame design and fifth wheel setup.

The details that matter most are the fifth wheel height, drawbar configuration, brake condition, and tire spec. A stationary fifth wheel is common on older and simple fleet setups, while other dollies may use steerable or self-tracking designs depending on application and state regulations. Buyers should confirm pintle eye condition, lunette ring wear, safety chain mounts, gladhand placement, and electrical connections because these are high-use contact points. On used dolly trailers, brake percentage and tire remaining are worth close attention since replacement costs add up quickly, especially if the unit needs chambers, slack adjusters, drums, or a full set of rubber to pass inspection.

Single-axle converter dollies are the standard choice for LTL, parcel, and linehaul operations running doubles. Spring suspension remains common because it is durable, simple to service, and familiar to most maintenance shops. Tire sizes such as 11R22.5, 275/80R22.5, and 295/75R22.5 are regularly seen, along with steel disc wheels. Frame construction is typically all steel, and many older Fruehauf and Eagle Rock units remain in service because the design is straightforward and parts support is still manageable through aftermarket brake, hub, and suspension suppliers.

When comparing used dolly trailers, focus on compatibility with the trailers already in your fleet. Kingpin height, pintle height, ABS configuration, axle track, and brake plumbing need to match your operating setup. Check for frame cracks around the fifth wheel plate, drawbar wear, suspension bushing fatigue, and corrosion in crossmembers or mounting points. A dolly trailer may be small, but it has a direct effect on tracking, stability, and legal compliance in doubles operation, so a clean inspection history and solid running gear are more important than cosmetics alone.