Why is the passenger side higher by 1/2 inch?

[BradO]

I think 23 gal. Anyway low fuel light on (less than 2 gal. gas). Measured again and the passenger side is still 1/2in higher than the driver's side on each wheel (ft driver 37in, ft passenger 37.5in, rear driver 39.5in, and rear passenger 40in from ground though center cap to fender flare). If driving it settled in the suspension, i would expect the front wheel to be off and others the same. The fuel tank is on the drivers side, but centered between the axle. My Armada is within 1/16in all around. I am going to the dealership tomorrow to measure other H3's on the lot. Just wondering if this is factory design, or if I should have the dealership check it out. To the eye it is not noticible. Drives great, so i'm not concerned about safety, just curious. If it's designed that way, what is the purpose? Thanks......