Since I am a klutze when backing at times, I build a rear bumper. Its mounted high enough to clear the rear receiver. Bumper is made of 3 one inch red oak laminated together about 4" high, mounted on both ends of the receiver using drop hitches and appropriate laminated oak blocks to give it the proper placement.
I know this isn't a project for everyone since I'm a woodworker, but thought I would share as the material could as well be steel.
Denny and Barb