I found the phone number of the company that manufactures Duracell batteries
HERE at the bottom of the document. I called and asked for customer assistance. The technical person told me their best battery for RV applications will be a pair of 6Vs, specifically the Sam's Club
EGC2 for $112.68 each. I said they are much smaller than a pair of 12V batteries of which they told me not to be concerned. A pair of EGC2s packs a big punch, outperforming a larger pair of Duracell Deep Cycle 12Vs in parallel.
So between all your comments & inputs, along with Duracell's inputs, I'll be buying the EGC2s from Sam's Club.
