Deep Cycle Starting or just Deep Cycle

My question would be what do you do to maintain the batteries when you are not using the motor home? I have single deep cycle/marine battery for my trailer and I am on it's 6th year. I use a trickle charter in the off season, and during the season when not using the trailer, only plug in the trailer about once a month, to keep battery up. If you are connected to power in the off season your converter charger could be "cooking" the batteries, unless you have a multistage charger. Also these batteries require regular water checks too.

Also I do not do a lot of dry camping, but have gone two days with not problems.