Our primary use of the Rv is to go to race tracks with our son who drag races. 3 out of 10 race tracks we go to have power hook ups. The other 7 we run generator or house batteries . I never knew the old ones had water/acid in them and they were junk end of last season. The ones I just took out are interstate extreme gc2-uxd-utl. They are 6 volt batteries. There are only 2. I did take pics and also zip ties the wires at the connection points. How long do the chassis batteries last too? Ours were put in dec 13. I will check out sams and also call interstate Monday.