>Two more cents to ponder. While the Optima may be the most compact,
>convenient, and powerful choice (and expensive) for the space available,
>mounting two 6 volt deep cycle RV under the rear bench (and venting them)
>will provide much more power and probably last longer for the money.

That's what I have in my westy (installed by the PO along with an electric (compressor type 12v and 120v) fridge.

~200Ah of battery for $120

Bill