Hasnít that been talked about a lot already? IMO itís a neat idea that doesnít make a lot of sense - like most concepts. All those batteries seriously limit your trailer (weight etc), are really expensive and note the lack of climate control on the batteries, and trust me you donít want Lithium without climate control.
The problem stems from the concept of not mixing functionality. In your house the roof is just a roof, and the power is a different system, so a repair from one doesnít affect the other. Itís best to have separate systems that just focus on what the do best. This concept mixes up towing and living. Better to put all those batteries in your vehicle.
Seperately Thor (Airstream parent) is partnering with a EV truck company for A/B class development.
Personally Iíd like to see OEMís and 3rd parties to focus on making the TV-Trailer system more aerodynamic.