Maybe more $ than you are willing to spend but I replaced the two house batteries in my Vegas 25.3 with two BigBattery owls
170Ah each.
Size wise, the were an easy drop in replacement. I then replaced the WFCO main board with WFCO WF-8950L2 which upgraded it to handle Lithium-ion. This was just a couple of screws and a few wires. I also replaced the BIM with a LiBIM.
We are getting "Tina" ready to live in when we retire. The house batteries were dead and I hope to not have to deal with it again for 10+ years.
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