[JRTJH]

The WFCO 8955 converter/charger can provide "multi-stage charging" to maintain the batteries in your trailer. It can provide "all" unused amperage to the battery bank. Essentially you'll have about 55 amps of "DC power" produced by the converter. Roughly 20 amps of that will be used by the furnace motor, lights, refrigerator/water heater controls and that amperage will not be available to the charger section of the power center, leaving about 30-35 amps to be used in charging.

Keep in mind that the "charge stages" are controlled by the battery voltage sensing circuits in the WFCO. So, even if you have a 1 amp trickle charger connected to your battery, the 13.4 volts it produces will "trigger the WFCO" into the "float stage" and will prevent it from charging your trailer battery bank. It goes without saying that if the WFCO is charging at 20-30 amps and you "clip on a 6 amp accessory charger", the output of that "clip on charger" will turn off your main charging system because of the voltage being introduced into the battery circuit.

So, if you want to use an "accessory battery charger" there's no need to even plug in your trailer shore power as you'll be "defeating its capacity" with the extra input.

It's best to rely on the battery charging capability of the WFCO and in almost all situations, it'll charge your trailer battery system faster, more efficiently and to a higher level than the "shumacker 6/10 amp charger" that you bought from WalMart..... YMMV