By visiting
Internet Archive Wayback Machine you could find the parameters of your WFCO charger.
We purchased our camper in October 2018. Our WFCO 8955 states: 14.4 bulk for up to 4 hours, 13.6 absorption for up to 40 hours, and 13.2 float charge. It seems the WFCO 8900 series is in most smaller campers.
We also have a 100 watt Renogy portable and Zamp port, with three 15' sections of Zamp 10 awg cable, and a Victron 100/20 SCC next to the batteries. With all three 15' sections having a controller on the portable means that it's sending lower voltage to the batteries resulting in an unacceptable cable loss, that's why the SCC is next to the batteries.
The WFCO could probably keep your batteries at 80% or more (just an off-the-cuff estimate), while a portable could be used to keep your LFP batteries charged to 100% many days.
Food for thought,
Perry