Search for 12 volt side of life .. Can't post a photo but I can a description.
First: I'm fond of saying "There are not six volt batteries in RVs" and now I will tell you why.
Take the first two Six volt batteries, Hook a jumper (At least auto starter cable) from the NEGATIVE on one to the POSITIVE on the other
Do the same with the other pair.
Now, you have two 12 volt batteries, same as you do now Connect to the remaining terminals exactly as you do the current ones, Ignore the already connected terminals connecting the two batteries.
or graphically
Two 12's
-Battery+
-Battery+
4 Sixes
-(bat)t(ery)+
-(bat)t(ery)+
(the "T" in the middle is the jumper. Each (**) is a battery, either six or 12 volt)
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times