solar power for dry camping & cpap machine

MrWizard wrote:
YES
But he wants this for dry camping, which means no shore power to lose at 3 A.M.

Being inverter, even with shore power is a safety, no problem if shore power drops out
But not the op question

Actually, the OP said in his opening post -"I also dislike rv parks, and I really want to spend my time elsewhere, and preferably not plugged in all the time."

Sorry, but "not plugged in all the time" by definition means he will be plugged in at some times and therefore subject to the vagaries of park power just as we all are. :R

I'm not suggesting "whole house" isn't a solution for some but there is more to it than just plugging the trailer's main service cable into the inverter. ;)