🚐 Wadoy RV Bumper Plug End Cap 4" Square Bumper Caps for RV, Camper, Travel Trailer: 2 Pack - Durable Protection for Your Vehicle Review

Very inexpensive, fits well on RV bumper but one side fell off when driving on washboard roads. I recommend taping it up if you're going off-road.

Lost a thing or two. I suspect those hollow bumpers are creating a lot of suction and draining those ends. After researching, everyone says it's better to use magnetic ones for better overall performance.

I have a square bumper that is just under 4 inches inside. They fit well and properly, they shine a bit compared to the old ones so I had the tires polished to match :-) I doubt this one will last a few years.

Easy to assemble but too easy to disassemble - over bumps! And the hole can be a problem for wasps, which climb into the bumper to make nests. I didn't think about it until I saw one buzzing around checking it out. I go with another brand.

These caps fit snugly in my 4 inch bumper but to keep them from moving I added a self tapping screw to the back of the bumper. The screw size is about 3/4. " long and #8. Simply take a Phillips screwdriver and twist out to remove the cover.