I'd prefer a more open forum category titled "Motorhomes Offroad".
This approach would open up the discussions to include the whole offroad spectrum for motorhomes ... EXCLUDING truck campers, tow trailers and 5th wheels.
Topics could cover such areas as:
1) Owner built 2X4 and 4X4 motorhomes to be used offroad - build topics
2) Bought 2X4 and 4X4 motorhomes to be used offroad - owner modifications and added equipment topics
3) How to drive a motorhome safely and reliably offroad
4) How to camp in a motorhome offroad
5) How to maintain a motorhome that is used offroad
6) Offroad camping destinations that are considered to be 2X4 motorhome accessible
7) Offroad camping destinations that are considered best traveled to only in a 4X4 motorhome
Probably a forum like this would get off to a slow start, but pick up steam eventually as more folks became interested in trying it with the advice of others in the forum who have done it. For instance, we take our MH offroad but with no real forum to talk about it much. :)