Car-V

Recreational Vehicles are expensive because they include an engine to pull what is in effect a recreational trailer. They also are great because you don't have to attach/detach from another vehicle. Trailers are good because they are inexpensive - but you need to supply another vehicle and those in the towing vehicle cannot interact with anyone in the trailer (if it is even legal in your state to tow with anyone in the trailer). I suggest a vehicle that "docks" with a trailer to create an entire Recreational Vehicle.

Imagine the engine component as something like a pickup - with sides of the bed that drop down to make the vehicle very low. You back the "pickup" into a "dock" under the back of the trailer. The trailer looks like a full RV with controls and pedals, but has no engine - power is transferred from the docked vehicle by wheel grabbing devices. Control is done "by wire" when docked. Perhaps it could even leave the front wheels down to become the rear wheels of the Car-V (although you would have to configure the transmission to work equally well in forward and reverse).

What is nice about this is that you do not have to mess with trailer hitches, and you can have a vehicle ready to detach from the RV if you need to make a trip once you are at your campsite. You can even use the "pickup" component as a regular vehicle all the time you are not RV'ing, and get all the use out of having 1 engine.