A lot of people call it Chevy Lean. Its tough to get your truck to sit perfectly level. Your tbars might need adjusting, your leaf springs might be wearing out or you may have an uneven load inside the vehicle. (This includes gasoline.)
sorry mike, but your wrong in this one, true there is chevy lean, but chevy lean is due to the gas tank being on the drivers side. his is different for 2 reasons, 1, he has a hoe/Yukon, they have the tank in the back in the middle of the frame, eliminating chavy lean, and 2, his passenger side is lower, so the opposite of chevy lean
as suggested make sure your on level ground and check your frame heights, if in fact that side is low, you can adjust your torsion bars and hopefully correct it. if its less then 3/4 of a inch, i wouldn't worry about it to much