There is a 10 builder who reinforced his nose strut and put C-206 wheels on all 3 wheels and replaced the brakes with double puck brakes.
Check out where's he's flown too:
http://www.vansairforce.com/communit...t=51393&page=3
Probably could get by with just the mains and the brakes and you'd have a pretty capable bush plane.
The other rv TDer's don't really improve your off field performance.