Why does the rear wheels lean in a little on my 2008 jeep patriot?

Hello, A little bit of negative camber (leaning in at the top) gives the vehicle better handling characteristics like control on turning, a planted feel while rolling down the road, and the vehicle self centering (to a slight degree). Too much will cause inner edge tire wear, and that can be seen on literally all BMW's made within the last 15 years. If the tire wear is excessive, have the alignment checked, and make sure the ride height is correct. If the ride height is too low, or if there is too much weight in the vehicle, the tires will lean in at the top.