I've used a very similar (2006 Z-71 5.3, same gears) truck to tow my 5000 lbs travel trailer. Flat land fine, NC mountains, will do, but I feel much better when towing with my 3/4 ton, with the 1500 I grip the wheel much tighter and you always know it's there. So, If that is your tow vehicle, I would get some thing light, in the 4000# range.