Adding on a very similar question: Does the bumper necessarily have to cover the frame element or could it just be attached to the frame member?
For context: the bumper zone is between 2" and 10," the base of our frame is 1.5" off the ground (up to 2.5"). We were thinking of attaching bumpers to the top of the frame, but not necessarily covering the 1" frame.
See the picture below for a picture with measurements, the plywood represents where the bumper would be.
