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No question that a Cortez is pretty cool. I would be as concerned about rust as about wiring in a half-century old vehicle.
As the door is in the rear (and the body is very well made in the first pace), I'd be thinking more along the lines of a fold-away tail as used on 18-wheeler box vans. Help in keeping the vehicle upright and lane-centered (with reduced driver inputs) is the real game.
But, utility while parked trumps FE. There is no way around this, in a general sense. RV mpg will be about careful trip planning more than any change contemplated once one "sees" that a moving house -- a few weeks here, then down the road 300-miles -- has high energy input costs per square foot all around, not just engine fuel (as one also counts operator-fuel as part of the equation; what is necessary to keep the folks alive and well must also be purchased, stored and carried . . and has limitations).
A motorhome pulling either a car or trailer with local transportation vehicles is okay for a group. Still won't match a car/trailer combo for overall lowest initial costs or operational costs.
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