Installed a weight distribution hitch for our M21 and it's awesome, love the set-up, only drawback are the clamp mounts for the spring bar chains interfere with the propane cover tank. It won't sit down all the way on the frame. i was ready to do a little trimming to the cover to allow to sit flat when I had a vision. I turned the cover around 180 degrees and it sits down perfectly on the frame, yes it's backwards, but at least I didn't have to cut it up.