Thanks for that photo (hope you don't mind that I saved a copy). Its good to see the battery setup, I've been trying unsuccessfully to acquire 4 of the original Larkspur batteries, but see that they seem to be regular automotive/industrial batteries in that image.
I know its a long time past, but there appears to be 5 batteries in that array?

Am I confused or are there 4 or 6?
Also note that the radios are mounted across the vehicle rather than longitudinally operated from the rear. Is there a reason for this, or so that they could be operated from the front driving compartment and rear tub?