[redpoint5]

No hacking needed to get 120v from the traction battery of an EV if you just connect an inverter. As long as the vehicle is "on", it will maintain the 12v battery using the traction battery.

I still like the idea of turning an RV into a hybrid by using regen to brake. It would be easy to implement in something like the Bolt with the steering wheel button for regen since it's a simple open/closed switch. Splice in a relay to those wires using a cheapo RF receiver, and splice in an RF transmitter to the brake switch/light of the RV.

One downside is most EVs including the Bolt don't coast when left in D (which is required to get regen). There would be a constant drag on the RV from the slight regen.

Estimating how discharged the EV should be when starting the trip would be tricky too.

Something I'd love to play with as a proof of concept considering the low cost to implement, if you already have an RV, EV, and associated tow equipment, which I have none.