pianotuna wrote:
Hi Larry,
Treat each pair of six volt batteries as if they were a single twelve volt battery. Wire them in a balanced manner. (see below)

Yes, this is exactly what I have. Only difference is that I have 2 (two) positive feeds from the parallel set. One feeds my 12v fuse panel, and the other feeds my inverter/charger. One feed is connected from the rear positive post, and the other feed is connected from the front positive post. There is a jumper between those two positive posts consisting of 400 amp copper wire which serves to balance the loads. There is a single, negative wire which is firmly attached to the chassis of the coach.
Keep in mind that these batteries do not feed the motor starter as there are two more batteries to do that job and they are not connected to this array.