If it were me I would replace the WFCO 55AMP WF8955 converter/charger unit only with the PD9260C charger unit and be done with it.
The PD9260C will fit in the same location of the WFCO 8900 series Power Distribution bottom compartment. Just hook up the DC output wiring and plug the 120VAC plug into a 120VAC Receptacle. You can also strip off the 120VAC plug and add ring terminals on the 120VAC side and connect directly to the WF8900series circuit breaker where the WF8955 Comverter unit was connected if you like.
The PD9260C smart mode 60AMP unit will automatically perform all of the required smart charging modes your two GC2 6VDC batteries connected in series will need.
You can confirm all of this with Randy at BEST CONVERTERS when you purchase the PD9260C unit.
This is what I would do at any rate... The PD9260C will recharge your two GC2 6VDC Batteries connected in series in about three hours time using the smart mode charging techniques. The only maintenance you will need to perform is maybe check the fluid levels every two to three weeks.
Just my thoughts
Roy Ken
