:h this is for the TT group. i have been looking to add an extra battery bank to the tub. when we purchased it. it had already been converted from a single 12 to dual 6. yea i know we haven't even ...
I just carry an extra (charged) set of batteries in the truck, then either jumper cable them over in parallel with the batteries on the trailer (through a set of fused cables), or swap them out when the trailer mounted ones get low. Then I'm not paying the weight penalty of the extra battery bank unless I'm dry camping for a long time. I'm using the Costco 2GC golf cart batteries.