Hi Mike, I have a 2016 NV200 van which I have turned into a surf van/camper that can still be used as a van. It was ply lined so I removed that fitted sound proofing and wiring for tow bar and refitted after covering the lining in carpet with carpet on the floor still abling tie downs to be used. A new double 4ft sofa bed from asda fitted perfectly between the wheel arches at a sensible price which can be removed to use the vehicle as a van. I have fitted a roof rack and top box and will fit the leisure battery in the top box (vented) with a solar panel on the top of the top box to charge the battery for my 12 volt cool box, 12 volt kettle and t v. Solar heated shower fits to the roof rack or back doors. You do not need to worry about a vent as there are two in the rear corners that vent to the outside under the rear bumper. I hope this helps TonyHello - after much kicking of tires on Promasters, small class Cs, and Transit Connects, I put my money down on a NV200 SV yesterday which will arrive in a week with a rear window and alloy wheels. For multiuse, including occasional camping, it seemed like the logical compromise. Got a good deal and preferred driving the NV and the 3" of extra cargo height vs the Ford Connect. Almost went for the full size Promaster.
I've being researching NV 200 sound proofing (placing Rattle Trap in selective areas), insulation (3M thinsulate), how to finish walls and ceilings after insulating, swivel seats, and installing a vent or window for air circulation - not sure what the best solutions are. Any advice from those who have already gone where I am contemplating going, appreciated.