You don't really say where you store your trailer. I have (2) 6v Trojan 105's. I top off the water if needed (distilled), and give them a full charge in Oct when I put the trailer away, and when I get it out in April, they're still almost full (according to my charger). I just make sure the batteries are disconnected from the trailer so there is no draw from smoke/CO2 detectors, etc while stored. I store inside a heated warehouse, so I don't have the cold weather to worry about draining them. 6v batts are designed for many repetitions of drain/charge, given their design for golf carts, etc, so not a big deal to let them run a little low, or feel like you have to fanatically charge them. Hope this helps. Best of luck to you with your health.