My 07 Tahoe LTZ has the classic chevy lean on the drivers side rear.When I have a full tank its about 11/4 inch lower than the passenger side.By the time I use a 1/4 tank its only 1/2 inch difference. My dealer says everything is in working order(auto leveling) and its normal . But it drives me nuts.The truck has 99k on it and runs down the road like a new one.Weak spring?Any thoughts or remedies you have done to level it out? Thanks ahead of time.