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I never thought about ex-anbulances I was looking ex-military vehicles for making a mobile camper. Ex-ambulances would be a be idea. Thanks.
Before building the frame on the trailer I would purchase flat poly tanks for potable water and waste-water. Also, add a box up front by the hitch with in the frame for silicon rechargeable battery, water pump and inverter for flexible solar panels along with a small solar water tube system using black irrigation tubing with fittings for hot water. Then you could have an out side shower sprayer hook up so you could shower out side in on of those camping privacy shower unit. Last but not least is a marine toilet hidden inside.