You do not need to replace anything.
You should make certain your converter has the proper profile for charging lithium batteries. If not you will always have partially charged batteries.
You should also get a shunt-based battery monitor, as the typical volt-meter based monitor in RVs will not give you a clue about your battery status.
After that, people start looking at changing the wire size from converter to batteries to take advantage of the ability of the batteries to charge faster. Not needed, but it helps.
If you have 800 amp-hours of battery, adding a hybrid inverter is a good thing.
Moving the batteries to an interior location is another wise move, for security and for temperature control.
If you get this far down the rabbit hole, a lot of solar panels are always nice.
2018 F350 Limited, 2021 Arctic Fox 27-5L
300 Ah Battleborn LiFePo4 batteries
3kw Victron Multiplus hybrid Inverter