Hi eddyturn, I'm not sure exactly what you mean (interior or exterior). Inside in the rear behind the sink cabinet area is the exterior shower attachment and space for a porta potti. There are many pics in my album, but I'll post a few here from there. Also, not sure there is enough space for a heater under the gaucho.
Sheriffdoug, it's a 6.0l gas (not sure if they have 6.0l diesel...think that is the 6.6 duramax that has the diesel in the GMCs).