The lift was already on it when you bought it? That's a cool find.
Emergency exits... Many RVs just have one main door and maybe a window in the back that can be popped out in an emergency. School busses typically have oodles of them - fronts, rears, middle windows, maybe a few hatches on the roof. Just keep in mind, even if you're not mandated to have specific exits, they don't exist just to satisfy code. They are there to help you escape from the vehicle if needed! If your bed's in the back (as many are), will you have a way to get out if the front half of the bus catches on fire? Food for thought.