Fully electric RV, diesel generator, RV of the future?

Regen from braking wouldn't be as important as from downshifting while heading down a hill. That's where we'd get the most recoverable energy in an RV. Agreed that a roof full of solar panels wouldn't do much for ya while driving, I'd expect them to help while parked. Many RV'ers park for 2-3 days at a time and along with a 50A park supply, I would hope the batteries could be charged up overnight. Along with a genset that is.

Really need to run some numbers.