A lot of good points being posted. I will say as an owner the two things that stand out about shuttles, over ambos or school buses, that I don't like are,
1, the curved walls. It makes doing an inside build much harder.
2, the windows. again building anything over waist hight becomes more of an issue (I did remove 2 of ours), major heat gain/loss, and living in a "fish bowl" at night.
I know that heat transfer can be cut down by covering/padding windows (same w/ the "fish bowl" effect), but not always easy on a curve. And if I have to keep covering windows (day time to keep the sun, or heat, out, or in, and night time so that I can have some privacy) I'd rather just not have them.
It is possible to remove windows on either style but, the shuttle has big curved sit-down style windows (only good for seeing out of when sitting) and the schooly has straight, flat, square (well prob rectangular) windows. Much easier to remove and space fill.
I did also cut out the low stairs and put in a electric RV set to get rid of that low-clearance issue. And yes, I do take it off the pavement w/o hesitation, haven't gotten close to getting stuck (I don't subscribe to running Max air pressure in tires, just the right amount).
I do look at every rig as a possible custom build and what would I need to change to make it more than just comfortable for camping, but to be a real full time live-in rig. Not everyone wants, or is going to, do what I call a "full build-out". Therefor sometime the things I point out are irrelevant, just saying.
