A tow hitch or tow bar is a device connected to a vehicle’s chassis for towing. A trailer coupler secures the trailer to the towing vehicle. It attaches to a trailer ball forming a ball-and-socket connection, which allows for relative movement between the towing vehicle and trailer over uneven roads. The trailer ball is attached to a draw bar, which is inserted and pinned into the hitch receiver to secure it. The three most common types of couplers include the straight coupler, A-frame coupler, and adjustable coupler.

The hitch is needed to draw a trailer with a car, truck, or other traction engine. There are different types of hitches such as trailer hitch and fifth wheel coupling. The fifth wheel coupling is used to attach a gooseneck style trailer to the bed of the towing vehicle, ahead of the rear wheels. It is used for larger trailers because it provides more stability than a traditional bumper-pull hitch.

To lift the trailer for hitching or unhitching, a trailer jack is used. The trailer jack is also used for levelling the trailer during storage. Common trailer jacks include the A-frame jack, swivel jack, and drop-leg jack. Some trailers, however, have built-in jacks.