Camping on battery power

Tired of going camping with your 1 battery and only getting 2-4 days from it. First get a bigger battery if possible, if not convert to two battery's either separate, if you have a tall skinny compartment build a rack for it and put another battery on top.

Or put a box and 2 batteries on the hitch.

Maybe you don't have the room or cannot have the extra weight on the hitch. You could make a portable battery box from one above or maybe an ice chest and carry it in the tow vehicle.