That is a bit better; but once again you are only getting about 6-10 amps per day back into the batteries. You would also need to buy a charge controller. I know the math side of it well, but I am not 100% sure on what the controller does. I do think it's main job is to make sure power is only going one way. So that when the sun goes down the battery does not start energizing the panel.
I've looked at solar a couple of times, and each time I figure I would be close to $500 minimum to get a decent setup. Then when camping I would be having to adjust the angle, etc. Of course this all assumes you don't have so many trees around you that you can get decent sun. I know from trying to use solar lights that it is hard to find a spot that gets good sun for most of the day.
My line of thinking is that for that $500 I'm sure I can get a nice pair of golf cart batteries; which should give me all the power I should need. And in the case of an emergency I can always plug the trailer back into the truck, run the truck and get a couple of amps that way too.
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