Good battery info on another thread.
battery drain (dead)
Talk to fishing guys that run the 24 and 36 volt trolling motors - bass and walleye boats. They will give you good advise on deep cycle batteries, automatic chargers with built in battery conditoners, disconnect switches, etc. Can't find a fishing fanatic, go talk to the boat/marine sales staff at Cabelas, Bass Pro Shops, etc. Basically you get what you pay for when it comes to deep cycle batteries. Simply lift batteries. The heavier they are, the longer they hold a charge AND the more they cost.
On a side note......I bought one of those new Indian motorcycles in 2009. Pretty good bike but she has a dark secret. With all the new computer controls the battery would be dead in 3 weeks if you didn't plug it in or at least go for a ride every other week.
As the new RVs get more and more electronic goodies added to them they are more and more like a dang nice comfortable house. Especially the Columbus models! Keep them plugged in or when power is not available, rotate the battery disconnect switch to off or your battery will be dead before you know it.
Even when things are off, electronics are still using a little bit of battery power. It really doesn't take much to kill a battery. Go leave the dome light on in your car. Leave that little dome light on for 5 days and guess what, your car doesn't start. That little trickle of power from one small bulb is the same thing your RV is going through when you leave it sit for 5 days during the work week and you go back to your sight on the weekend. If your RV wasn't plugged AND the battery switch was on, you may end up with a dead battery.