I recently upgraded to Lithium and ended up with this charger for $169 off of Amazon. It pulls about 9amps on the 120V circuit when applying a 60+/- Amp charge to the batteries. It cycled thru the phases as advertised.
RecPro RV Converter 75 Amp | RV Power Converter & Battery Charger | 4 Stage Smart Charging | 120VAC to 12VDC | 13V to 16.5V Operating Range
I relocated the charger to the battery area so it is more accessible. To remove the previous one you had to remove wall panels in the basement. I used an 15amp rated 6' appliance extension cord.
4 stage would imply that it also has a "desulfurization/equalization" setting. You need to make sure that it NEVER, EVER goes into that mode or your LFP batteries are done for. Hopefully there is someway to turn that off or disable it, or it's smart enough to never go into that mode. I'd be very scared of that one.