Thinking about converting and ambulance to an RV

Yes, they are one of the best bargains out there. I bought one on a Freightliner FL60 chassis and started to use it as a TV for a Airstream trailer as my 4 wheeler would fit through the double rear doors but it was not a crew cab so I resold it for twice what I paid. Not sure you need a MDT as many are on E 350 or 450 chassis, like this one. Adding plumbing will be a challenge.