We have decided to buy a TT as we spend quite a bit on hotels, but we've also figured it would be a good way to reduce our costs for awhile so as to focus on paying down debt and saving $$$ for a home...
I use, and like, a portable solar panel. It's enough to keep my lights on, electronics charged, and the fridge running. I'm normally camping high enough in the mountains that AC isn't an issue.
My solar set up does not provide enough juice for my furnace or a portable heater. To run those I carry a generator.