Is there a difference between the OEM cord and after market, except the $20-$40 price difference. Also a folding or portable solar panel is in the future, I need to get this and prove it out before SWMBO goes out to use it. Yes you are correct, right now is camping and in a few years at retirement the travel trailer will be the house for a few yearsI think most here are suggesting batteries bigger than you need. I use a 12v, 20Ah lifepo4 battery for my CPAP when camping and for power outages. Get the OEM 12v cord, not the after market one. A folding 100w solar panel and PWM charge controller should keep it charged if your usage is anything near mine. Remember folks, he is camping so it needs to be portable.
Bob