Hey M@tt,
Sounds like you’ve got your mind made up but let me mention this anyway. You can put in 4 Trojan T-125 6V 240Ah Flooded Lead Acid Deep Cycle Battery’s for $800.00. These are easier to handle at 70 lbs. each, you'll gain another 80 AH, and you'll save $140 bucks as well.
I understand the benefits of an AGM battery over a lead acid battery, but if you don’t have to have the AGM’s and you don't mind checking water levels occasionally, this might be a good alternative.
Just thought I’d toss it out for your consideration.
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