Remember it is much safer to secure the hitch to your vehicle's frame than the bumper. There must also be a safety chain connecting both vehicles, strong enough to control the towed vehicle in case the hitch fails. The law lists specific types of trailers which must be equipped with turn signals. Remember, turn signals must be installed on all towed vehicles when the signals from the towing vehicle are obscured or obstructed. If at any time you have a question regarding traffic laws, don't hesitate to call the nearest office of the California Highway Patrol.
Correct pressure gives longer wear.
Noise - Mufflers wear out. Belts - Look for wear, and a snug fit on drive belts for fan, alternator and air conditioner. Also, change oil filter along with the oil. Air filters also get dirty. Good shocks give maximum control.