[coal miner]

I've towed for years. Trailer tires should be changed every 3-4 years no matter how good the tread looks. Unlike car tires, trailers take a big beating on the side walls as they drag across the road every time you turn. If you want to risk changing a flat tire on the side of the road & trying to jack up a heavy trailer than use old tires. Be my guest. Do not use Carlisle tires, they are no good. Coal miner in Florida