Someone should make a web site for cruisers in the market for a new bank,
where you can plug
in your bank voltage and installation
maximum dimensions, then
your location, revealing the known-good true deep cycle makers sold into your market,
let you prioritize that list for your preference,
as well as chemistry preferences FLA GEL AGM
and it shows a list of batt model options that fit your space, with the max total bank AH and estimated RRP.
Then maybe a paid option, select your choice and get a list of vendors, with contact info, that service
your location and are likely to carry your selection, in distance order.
More likely to be helpful paid for by the buyer, but perhaps supplemented by paid sponsor
ads off to the side, keyed to the user's location and selected preferences.
If someone doesn't take this and run, I might have to do it.