Hi Nick; Welcome to Permies!
Now that your over here in the
rmh forum, lets hope we can get you some responses.
Short
answer is... its very hard to do.
Several folks have posted about their intent to build a
rmh in a vehicle. I can't recall any who posted back, as successful. (i could be wrong)
Problems are of
course, the weight. Also the vibration and bouncing of a moving vehicle would tend to crack a clay construction.
A temporary, metal rmh could be built. But the weight of a mass still creates all sorts of suspension & handling issues.
I'm sure that it can be done (easily if the bus stays parked) but will it last and be safe?
Let us know what your
plans are, we love to help.