I've been interested in ambulance conversions too.
For a weekend camper, it could be pretty cool. Ambulances are usually pretty well beat on by the time they're sold, though not always.
Welcome to the forum.
The ambulance is interesting because of all the built in storage and solid contruction. But it might be tough to me to fit us all into given all the built-in. The open floor plan of a gutted bus might work better.