I've always felt the lack of room for tools/spares would be the downfall, of course, I could rent space to you in my buggy
Campbell's built one hell of a nice rear engine two seater awhile back.
couldn't find pics, but i'm pretty sprung on this too
http://campbellent.com/full%20size%2...KERRYW0032.JPG
as low as a moon buggy is, I think you could put a small rack on the roof or above the engine or something that could hold water/food. of course, there's always co2, recovery, cb, a million other things to stuff in there somewhere.