Swivel wheels for 5th wheel

[D&D Young]

Swivel wheels for rear of 5th wheel. We recently purchased a Montana 3811 ms and we are having a difficult time getting it down to our house. We live on a narrow street that has approx 27 degree grade on one section if the hill. the bottom levels out and the rear of the unit will scrape. We ended up putting boards under the wheels to raise it high enough for the rear to clear. We removed the hitch from the frame and we now just clear It by like an inch. Does anyone know if the make small swevil wheels that can be connected to the frame that would raise the rear up a couple of inches without damaging the frame. There is 13' from the rear wheel to the end of the trailer. I have seen this type of wheel on travel trailers but never on a 5th wheel.
Yeah I know It was piss poor planning.