do not run old trailer tires.

video pretty much speaks for itself. 8 years in the transportation industry and I can tell you without a shadow of a doubt. if you're tires hit the four-year markets time to change them. 5 years is going to be trouble. beyond 5 years I can all but promise you you're going to regret using them tires. it does not matter how good they look, doesn't matter if you see dry rot or not, and the tread depth means nothing.