I'm starting to look for new tires for my silverado 1500. I've had good luck with the cooper at3's but am considering the copper rugged trek. I can get my factory size in the XL rating, but if I go up a size 10 plys are available. I know the 10 ply is what everyone is going to recommend but it's almost 40 dollar difference in price per tire. Wondering if anyone has any experience with both for a comparison on driving Montana gravel roads.