AGM energy density is slightly less but similar to FLA so capacity that will fit in the Axis step remains the same. The benefits I see with AGM for RV use is less maintenance, faster charge and maybe a bit more DOD assuming a proper charging system (not the factory installed charger).
The cost of AGM would have to drop considerably to compete because Lithium has already reached similar or better cost points for power storage.
This lithium battery example shows 15% less cost to provide the same projected energy @1000 cycles:
$360 for
TROJAN 31-AGM 12V 100AH provides >500 80% DOD cycles
$615 for
LiFeMnPO4 Prismatic 12.8V 100Ah provides >1000 80% DOD cycles
EDIT: I just noticed that the link I gave was $100 less than I had in my spreadsheet from previous 100AH AGM lookup that I used for calculation. So, my example statement is WRONG! It's back to AGM pulling into the lead again for being more cost effective. The point however is that lithium is quickly eliminating reasons for advancing lead acid battery solutions in any configuration AGM/GEL/FLA.
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