Originally Posted by mtbackpacker
And yet, if you have the 6.2L engine then your rear axle is the same as the one in the max tow package and is capable of a 4200lbs rating with the rest of the changes (cooling, springs, shocks). The sticker on your hitch itself will tell you it is rated to 12000/1200. Lots of different variables here but it is pretty clear the soft ride of the AT4 suspension is the limiting factor here (the brakes are the same between max tow and AT4 as well).
Although the 6.2 has more horsepower and torque, it is heavier: the 1500
crew cab with a 6.2 is rated for towing 8800lbs. A non AT4 crew cab with a 5.3 is rated to 9200lbs. The AT4 crew cab with the 5.3 is the one that jumps up to 9800lbs.
With a 20’, the AT4 with the 5.3 is enough... if I had something larger, a 27’ or a 28’, I’d want to step up to a 2500 for the payload difference, but not needed for how light we roll (not bringing along lots of extra stuff, just two of us, etc).
I will say, my AT4 is a lot more comfortable than my previous Sierra... I am okay with the suspension change.