If you do consider solar make sure your camp sites have direct sun available. Where we dry camp the trees are over 100 ft tall and very dense and more than likely it will be raining off and on half the time we are there. There is very little direct sunlight and the rest of the time it is deep shade. I use solar here in sunny TX when the trailer is being stored at home for battery maintenance. For us, a small (1000 W) quiet generator is a good solution with a single Gr27 115AH deep cycle 12V battery.
What is extremely important is that you make sure that your battery(s)have been well maintained and are in good condition so that you are getting the energy storage you expect.
Dick