They are out there, three basic ceiling heights that I can figure out. Not sure they all measure the same, but the Thomas Pushers are available in 6-0, 6-3 and 6-6 interior height. You can tell by looking at them from the outside, look at the roof line, if the roof line drops right after the front cap, then you got the low ceiling, if it goes straight it's the middle one, and if it goes up a little it's got the high ceilings in it... If you find the 6-6 bus they are more rare, but they are out there. The other makers have similar packages, not sure if the measurements are the same...
You just might be a Redneck if...
...your motor home used to be a school bus!
...Your living room has a steering wheel!
...Your home has brake lights
1994 Jeep Grand Cherokee
1989 Thomas Diesel Pusher (Cat 3208/Freightliner)