Maybe I went over board, but when it came time to replace the battery in our B, I went with two golf-cart AGM batteries. 220AH and I've never come close to tapping them out. Love it.
They are inside the coach, so the venting issues were a concern for me. PLUS - I kept them in a vented battery box. That was probably not strictly necessary, but the holes were already in the van from the original box - so I just retrofitted a larger box to the existing vents.
I wanted to double up on that setup even. But when you start adding up four golf-cart batteries, the weight gets on up there, and I became concerned about weight distribution, since mine aren't centered on the midline of the van. I think they weigh about 70 lbs each.
2003 Forest River MB Cruiser - Completely rebuilt in 2012
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