Rear bumper "eats" paint
Between the rear door and the bumper is a fairly small gap. Large gaps just don't look good. However, when it comes to off-road performance, a larger gap would have been better. When negotiating uneven terrain the frame takes most of the twisting stress - due to flexible rubber mounts the body is not affected by the twisting forces.
Both front and rear bumpers are mounted to the frame and follow its every movement. Frequent flexing of the frame on bumpy dirt roads brings the bumpers many times in contact with the front grille and the rear door - scraping off paint from both lower corners.
So, if you like the rough outdoors check the lower corners of your rear door before the paint is all gone and it starts to rust.