Floating voltage value is key where if just slightly too high, your Li won't last long. Temperature compensation is vital to ensure that does not happen. (Temp comp not common among RV converters)
It is all very tricky, especially if you recharge to full when the elements are most reactive.
(From what I have read so far, it looks like RVs and Lis don't mix very well in most RVing scenarios)
This has interesting bits all the way through to the end:
https://www.electronicsweekly.com/market-sectors/power/float-charging-lithium-ion-cells-2006-02/