Update here- Still have not located the charger/inverter/converter, but was doing some testing before continuing to try to find that.
We disconnected the trickle that was charged into the house batteries, and moved it back to the chassis, hoping that was the entire problem, but it appears not. Plugged into our house for three days and fully charged the house batteries, no issue there with charging- Disconnected it two days ago, and yesterday the battery showed 1/3 charge by end of day. This morning, battery is showing dead and have lost power to the microwave, but can still turn on the house lights. It appears something is draining the batteries, but I have no idea what or why they cannot stay charged even for a couple days?