Here is the front wheel drive motor home I had. Sold because I lost my parking space.
It was 18.5ft long. Here is a proposal for a new body with the same drivetrain.
At a fineness ration of 4:1, it would be 32ft long; with similar interior volume but 50% higher licensing fees. But it would have gone from worst to best case for aerodynamics.
The Clark is gone, but I still have a Lexus motor-generator* that could power an electric version about the size of a Dodge van or VW microbus. So it still could be built.
Edit: *Now that I think about it, the folks at EVTV are reverse engineering the Tesla drivetrain CAN Bus messaging. That would be an appropriate size for a motor home, about 400hp.