We bought Copper tires Discover H/T, 10 ply. Advertised to have a 40, 000 mile treadwear warranty. We have 12, 000 miles on these tires and they are wore out. Copper will not stand behind their warranty. Gave all kinds of excuses not the proper tire for our truck. Its the tire that was recomended. Not proper tire pressure, had what was recomended. This is a 10 ply truck tire on a Chev. 3/4 ton truck. We pull a 5 th wheele trailer. The tire (Bridgestone) we took off had 45, 000 miles on them and had more tread than these with 12, 000 miles. We... read full review »