Any kind of truck you like. One simply does not hear of many cheese truck hijackings, so it would not be expected.
Alternatively, travel across the country, playing music on street corners for food and gas money. This works best if you bring bothers along to help out.
Man, I sure wish the second plan would work...
Unfortunately I doubt we could make enough to pay for everything. And I may not have enough vacation time to drive.
But...it just seems like it'd be such an interesting adventure!
Catch is that busking is really frowned on in some states, and in some places you have to have a license (!) to do that.