This was my solution to the draggin' rear of our 27' 2000 Four Winds:
It took care of the vast majority of road to motorhome "interference". The angle brackets still dragged occasionally but they didn't take near the beating after installing the roller.
I built this from a purchased roller and a section of an old ball mount. I had the roller hanging under the receiver & attached with the hitch pin for a while, it was always dragging, and twice I buried it when backing - the first time was in gravel, and it high centered us - I dug in the hard compacted gravel for several minutes, then finally worked it free. The second time was in a dirt bank, and had to have a little assist from a Toyota pickup. (Just a little tug was all I needed)
After those two experiences, I decided it was time to build something that wouldn't act as an anchor.
The MH originally had a pair of caster wheels on the hitch, but one had been hit hard enough to bend the base & eject most of the bearings. Casters are not designed for hard impacts, though they sell them for this application.
Let us know what you decide on, and how it works for you.