A camper trailer with on-board batteries, motor, and regeneration.... Yes please!
www.greencarreports.com
Extra battery capacity and power only when you need it. Please have all this ready in a couple of years, ok? Ok.

Towing with an EV: Are electric trailers the future?
A German travel trailer prototype provides its own electric propulsion and effectively doubles the batteries—meaning that there might be no drop in range from towing.
Extra battery capacity and power only when you need it. Please have all this ready in a couple of years, ok? Ok.