I have decided since I can't keep from inadvertently running down the house battery too far and destroying them, I will just use Walmart batteries. At least they are not that expensive to replace. I...
Yes I would fully charge the battery when you're done camping and disconnect it till the next trip.
Walmarts are everywhere and the battery warranty can be good. Batteries are decent. I have solar, have the AGM batteries, and not concerned about accidental discharge. But lacking this gear, just top off your battery at end of trip and disconnect. If it is long time between trips put a trickle charger on it occasionally. You'll then be doing more than most.