Good answer all around.
No need to buy stuff unless you find a need for it. You will figure it out as you go. If you are just pulling into a Walmart for the night your TV (tow vehicle) should charge things up while you drive and solar wont help unless you stay the day with panels out or mount them to your roof.
100W Renogy Solar Suitcase. Mine keeps me charged up if there is good sun. Ebay $200
I run 2 G24 (Stock) batteries, and get 4 days out of them with no solar, when I try. With solar we run the fan vent (on 1) all night every night
When they die ( I'm trying) I will go for the twin 6v upgrade but so far power has not been an issue. I have a generator and solar and hardly ever run the generator.
I replaced my Television with a 12 volt one with a built in DVD player. So they are available and easy to find on Ebay. Then we had a power surge that killed it and now we run no television and I removed the antenna. Has changed the way we camp for the better.
cheers John