Wally world does sale a rv battery in a 29 series and My box is set up to hold the engine battery and 1 deep cycle battery. When I got it the coach was a 27 series. That went twice and I went to 1-29 series and it lasted 6 years and in 2002 we boon docked in the White Mountains and it had to be charged every couple of days as the computer and radio and lights and fan sometimes would drain it down about every couple of days. Was rated as a 205 amp/hrs and I just replaced the battery with a new one last month! I don't recommend doing that with one battery as ya drain it down over 3/4%. I killed the battery several times but, it always came back to life.

Either Trojan T105's or Interstate U2200's are by far the best bets.

George

I've been using T105's for both of my rigs. I recently needed to replace them and checked with the local dealer and didn't like the warranty/price. I checked Consumer reports and purchsed the deep cycle they recomended. Think it was Kragens, better warranty and better price than the t105's. Any way check consumer reports. I don't do much dry camping so i'm not worried about the long use of the batteries.