I'd suggest some folks read the OP's posts on this thread before insisting he'll need a generator. His trailer does not have slides, water tanks, etc. He does not run TVs, stereos, etc.
Steve - I would put in a group 31 AGM battery and carry a couple lanterns and a cooler for backup.
If you make it through your longer stay without running out of power, then you're fine as is. If you run out during your trip, just go get some ice and finish the trip. Then pick up a second battery to switch out. And remember with the AGM, you can install it sideways and without venting, so you might be able to fit both already wired.