A trailer is an unpowered vehicle towed by a powered vehicle. It is commonly used for the transport of goods and materials.
Utility trailer with a folded loading ramp
A boat on a single-axle trailer
ACP Backtracking genset trailer
Touristic road train in Nantes, France. It has three trailers.
Towing is coupling two or more objects together so that they may be pulled by a designated power source or sources. The towing source may be a motorized land vehicle, vessel, animal, or human, and the load being anything that can be pulled. These may be joined by a chain, rope, bar, hitch, three-point, fifth wheel, coupling, drawbar, integrated platform, or other means of keeping the objects together while in motion.
Large ballast tractor pulling a heavy load (a transformer) on a hydraulic modular trailer using a drawbar
A British Airways Concorde being towed in New York City
Travel trailers are a familiar type of recreational vehicle
Lowboys carry very heavy loads