TV to Charge house while under way

Hi Folks... Ive been chewing on the idea of investing in Solar but have stayed away from it simply because we carry a 3000 watt inverter generator. trouble with this has been that often times on our last long road trip we never stayed in one place long enough to really top up the batteries and by the time we did get a place where we could plug in and bulk charge we had sucked out the batteries pretty deep - something I'd like to avoid doing again on this years trip.

So...

I have been thinking about using the truck to charge the 5th by running some decent copper (0/0 or 1/0) to the rear of the truck and using an anderson connector to make the connection to the trailer.

questions / advice around how best to make this come together..

the truck already has dual batteries, Im assuming there is a factory installed isolator - assuming.

So, which battery would I hook up to ? would I install another isolator and where would that one go ?

I figured I would simply install an isolator in the truck nearest the most convenient battery, perhaps a disconnect switch on the line in the 5ver

any other thoughts ?

cheers.