Second battery
Our camper has only room for one group 24 battery. A few years ago I added wiring and a multipoint switch for an additional battery to go ahead of the rear wheel well but have not used it until now. ...
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I added a second battery (in a box) in the wheel well that plugs into the side of the camper and wired into the main battery box. I added a switch that allows Bat 1, Bat 2, Bat 1 + Bat 2 & off. wasn't very expensive off eBay and now I have all options. My batteries are currently mismatched so I run one at a time. I may not even switch to parallel when I eventually get matched batteries since switching batteries gives me a good indication when I have used roughly half my power. I usually run off the old weaker battery first. When I'm on the road and plugged in every night I switch between the batteries every few days just to keep them both topped off. Same time I put in the battery switch I added a meter beside the switch so I could quickly decide if I needed to switch batteries.
