[f6bits]

This was my concern when plugging the trailer in *and* using an external charger. Both the converter and standalone charger will be hooked to the battery and may confuse the other. If both are “dumb” chargers, then they’ll both be running full bore. If one (or both) are smart chargers, they both might kick down to a lower charge.

Originally Posted by smiller

You won't hurt anything by using an auxiliary charger, but don't hook up more than one charger at once. That still won't hurt anything, but it will greatly lengthen the charge time as the multiple chargers will sense each other's voltage and think that the battery is nearing full charge, causing them both to fold back to a low charge current. This is obviously not what you want.