That was my plan but I got restless
I absolutely hate FLA in an RV House battery situation. I think it should be outlawed and I will never ever buy any new RV that has FLA House battery without a plan with the dealer to trade them in on AGMs.
Note: My Chassis battery is FLA and it has no issues. I don't water it either
and I will NOT water it. When it goes; I will buy another, but maybe get maintenance free.
I bought my Pur AGM VMax tanks for the House batteries 6 months ago and it has been all the difference.
I stop short of recommending to anyone anymore right now because the last I checked; they were incredibly expensive? I got my two 125ah SLR batteries for $500 total out of pocket expense, no tax, no shipping, no core charges etc.
For OP, if you are price conscious you should consider the Duracell AGMs at Sams, it is what I was going to buy until I learned about the Pure AGMs versus the Dual RV / Marine batteries.
Oddly I consider myself as price conscious, but I found the $500 a steal of a deal.
Unless they work out issues with Lithium around freezing , charging etc. I am never going to consider making the modifications to Lithium in my current RV, rather I suspect my next RV may come with Lithiums? I put this in the category where I had to find an RV with 2 ACs and 50 amps service versus a plan to add a 2nd AC to a 30 amp unit that I otherwise had found a good deal on.