I would think that if you started out with a fully charged battery in the prius, it would get you through a fair number of hours of AC use.
The idea way of doing it would be to figure out a way to link the RV brakes to the Prius' regen braking. Imagine the poor little prius attempting to regen brake 10 tons of RV.
I think we will see some sort of hybrid drive before long on RVs for the simple reason that it serves double duty. It gives that extra oomph needed for hill climbing and as a high capacity inverter, making noisy generators unnecessary.
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