Keeping battery charged

Buy a battery maintainer. I use BT Jrs (.75A) on everything I own and do not have battery problems. This size is more than sufficient to keep your battery(ies) fully charged and ready to go. I had two on my previous Class A to take care of 4 batteries. Low an slow is the best way to charge and maintain batteries. High discharge and recharge rates are what shorten battery life and they get enough of this abuse while camping.
Randy