Just as a data point, here's the batteries I installed 3 years ago. They are not sealed but I've only added water twice in those 3 years.
Interstate 8D Specs
I paid retail because it was more practical to do the replacement here at home and home is near the end of the line. There are no competitive outlets for things like this.
FWIW
On edit: Our coach uses two of these for the chassis/engine. The house uses four 8D AGM's.
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Dave & Cathy, 2002 Country Coach Affinity, 42', #6103, CAT C12, Sold - Retired From RV'ing, Linux Mint
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