Just brought a new Chev Silvarado 1500 with 20" Goodyear Eagle tires. When doing a little research on the tires, which I wish I had done before buying the truck, found out they're passenger car tires....
We have the GMC Sierra w/ 20" tires. We put new Cooper's on for our trip to Alaska but had trouble finding rims for a extra spare (the factory spare was only 17"). We took our two best take-offs with us and stayed on the internet looking for rims. Bought two rims in Anchorage and had our spares mounted. We towed just under 15,000 miles on some very bad roads.Had no problems. lizzie