Re:batteries
We carried a VERY heavy 4D off Bribon to the battery cemetery and replaced with 4 6-volt golf-cart batteries from Sam's Club, I think it was.
Much easier to handle 4 lighter batteries, they're inexpensive, and a good way to get 400+ amps.
They seem to be generally taller then marine deep-cycle, but take up less space than two 4D batteries.
They didn't come with handles, though...
Peter