skis
Years ago we had a Rans S-12 that we took the wheels off and mounted snowboards for skis and they worked great. A pain to put on dollies to put in the hanger.
You would want BIG snowboards, probably upper 60's to 72 inch long for a RV. Do your home work on rigging the stop cables, crust cutter cables, and bungies. There is faa information available for proper angle to prevent dumping (front of ski goes over and is pointing down),travel etc. Skis are lots of fun.