Won't charge if you don't, at least most cases.
If you leave your power switch off with the vehicle plugged in then at least make sure you turn it on so the battery charges fully once per month. That can mean leaving it on for a minimum of three days for most converter chargers.
Batteries will self discharge a certain amount on their own with no other load connected. If you have a multi-stage charger (most late model RV's do) just leave the battery connected and regularly check the water levels once per month.
"A wise man can change his mind. A fool never will."
"Sometimes you're the dog, sometimes you're the tree"
2018 Flagstaff Micro Lite 25BDS
2004 Nissan Titan