I have 2005 Fleetwood Jamboree The batteries went dead. I got new AGM Batteries in July of last year. When I first bought my Jamboree 26Q I replaced the 2 batteries under the step and added 4 more to the coach I also replaced the chassis battery, They were all Interstate U2200 6v batteries. And a Chassis battery that was was an Interstate. I bought my RV in 2006. I also added Solar Panels and a Xantrex 2000w inverter When I replaced the batteries they were all boiled dry. Interstate Chassis Battery for 2004 Ford E450 group 65 chassis battery.
The inverter/charger is und the dining area seat. I don't know what brand your rv is . Also my RV is a Class-C no slide outs.
I think I did pretty good I got 11 years out of them. Even though I really neglected my RV and the batteries. I believe the solar panels boiled my batteries dry.