This is not a RV application but there seems to be a lot of solar knowledge on here so I thought I would ask. I run a 12V system in my remote cabin for LED lights and RV size water pump and CD play...
It is obvious from the way we are all re-arranging the OP's life that it's all the OP's fault in the first place.
If he were a proper BC native, he would restore and use one of these instead of riding that jet boat. Then he could carry those big solar panels plus carry batteries back and forth. In fact, he wouldn't need the cabin at all--just berth alongside where the cabin is now and live on board.