2007 5.7 tundra pulls my z21 with ease. granted i'm in fl now so no mountains to go up like I had growing up in ky and tn. I dont think you can beat a tundra for a half ton. however if you want a truck that can tow like a champ go with a ford diesel, best trucks for towing, but a lot of truck for just towing a bass boat a few hours. waiting for toyota to release their diesel truck.