I will second the comment to get solar. However, I had TM wire for solar, including the controller, but left the panel off. I got my panel from WindyNation, a 100w panel. Certainly saved money, as the panel was about $120, if I recall. TM wants about $1,000 for the entire system. We didn't break-out what the controller and wiring cost, but with the net price, I was happy going that route.
Also a second on the cassette toilet. That is all I have had in both of my TM, but I am much happier not having to go to a dump station to empty. I can take it and dump every few days, if I want. To me, it is a good setup.
Two 6-volt batteries have more power, and last longer, than a single 12v. But, they take up more room. Tradeoffs. I have one 12v, with a solar panel, and I have plenty of power for us for at least a week. Have not run low on power on any trip. But, I have LED bulbs inside. Until I run low on power, I won't change my setup.
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