Best Towing Accessory I have ever bought. I installed them on the back of my 2017 Ram 3500 to protect the fifth wheel. I had to cut 2 inches so I could use them with a truck with different ride heights. This will get them about 2 inches off the road when the truck is loaded and level. I always leave them installed. They are located under the rear parking sensors and just two inches from the rear bumper. My truck is a double-length flatbed, but it's still six inches to my Montana fifth wheel on tight turns. I've put 3500 miles on my 5th bike in the 3 months I've owned them. I had to clean and wash a lot of dirt from the face of these valves, but the face of the 5th wheel remains dent and chip free.