Another Option - Gel Cells
I used to full-time on a 42ft catamaran. Similar setups with house batteries on sailboats as you might imagine. We switched from AGMs when they died and bought less expensive gel cells in the same 6v configuration.
For my money - the gel cells provide ease of maintenance (almost none), nearly equivalent amp hour ratings (the AGMs are slightly higher as I recall) and a price point that is far more reasonable than the Lifelines. Have always had good luck with the Deka / East Penn units.
Your Magnum charger is the same as mine I believe. You should be able to set it for the gel cells. Remember DO NOT equalize a gel cell battery.
My $0.02.......
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Mark
'07 Essex (Sold)
'21 Jeep GC dinghy
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