Well I have 6K miles on my ZR2 and it has smoothed out with road force balancing done at the shop. One other thing I have found with my truck is that towing a trailer is not good. I know these trucks are limited because of the tires and lift, but I know my 6.2 Trail Boss was much more aggressive when towing. The issue I am talking about is when you come to a hill, the rear end feels bouncy or rough and I cannot figure out why. Is it the shocks they use or is it something else that I am not aware of. After all it is a truck and I should be able to tow and with the 6.2 I should be able to rip the hitch off.