Adding more batteries - suggestions?

razntwn

I've just changed my 2 X 12v batteries (SRM-24s) with 2 X 6V (GC2s) but would like to wire in another 2.  Anyone already do this and figure out where to mount them?

I presently have the 2 batteries on the tongue and moved my spare to the tongue also.  I have a CS-S and was thinking under the sink in the galley in the back to balance the tongue weight.

Any insights or suggestions?