We owned an 08 Vacationer XL and the fix to your problem is around $20.00. I used a Battery Tender Jr, .75A maintainer. Your choice of manufacturer may be different. Install the charging head in the LR storage/electrical compartment and run the wires across to your battery compartment. They are long enough. When you know you will be sitting for an extended period of time plug the maintainer in to the 20A pedestal plug using an extension cord. I had 2 on my XL. One for the chassis batteries and one for the coach batteries. When we would come home off a trip I would back in to the shop, turn off the battery disconnects and plug in the maintainers. When we were on shore power (traveling) I only plugged in the chassis maintainer. We never had a dead or low battery whether on the road or in storage and maintainers will extend the life of your batteries. Slower longer time period charges are easier on a battery than short high amperage charges.
Randy
