I tow with the 07 Silverado crew with the 5.3L and 3.42 gears (2WD). I think the truck does well pulling our 5000k loaded TT on open, flat road but it doesn't pull well in moderate inclines. I'm going to try dropping it in 3rd the next time we hit the hills and see what she does but I'll also have to keep an eye on the transmission temp when doing so. I'm looking at upgrading to a 3/4 or 1 ton this spring...it seems we pack more and more every trip and I'm sure we are going to exceed payload (if we haven't already).