You're not wrong, but I looked into this a few years ago...at the time it was roughly $15k to switch over to solar, and that was without install costs. I don't remember if that included batteries, which you would need at night.
Until they create an electricity shortage. The grid is just as vulnerable as the pipelines.
Bio-fuel from algae will be the future. They can make it now, but not sure how easy this will be at home.
This could really hurt our trip to the Florida Jeep Jam this weekend.
I've posted this before, but the same JL has a higher tow capacity overseas. Why, I don't know. So you should be ok.
That said, I would have picked a smaller camper or found a different vehicle to pull it.
As far as I know, it will look to the radio (FM or satellite) first. You need to choose media-bluetooth every time. Android auto/car play is a little better if you're using a cable, but I don't remember if it will default to that either.