The number one cause of tire failure is too low air pressure.
Go by the DOT date code not when you bought them.
Do not exceed the legal speed limit for towing. 55mph max. High speeds generate more heat and if you get a flat the vehicle stability is harder to control.
If available have the tires inflated with Nitrogen. It is a dry gas, larger molecule.
Maintains pressure longer and retards internal tire/wheel corrosion.
Always check the pressure and your valve stems before each trip. Inspect the back side of the tires as well.
Use a mirror if unable to see easily.
Tires can pick up damage from objects on the roads on both sides of the tire, not just the side you can easily see.
Replace tires by time as the rubber compounds degrade and harden losing flexibility with age.
Just like coolant hoses, the liner usually fails first.
Tires are cheaper than accidents, trailer/car damage and lives.
If you buy tires before you need them, the most can can lose is some money.
If you buy them after you needed them....
