On the new TT:
There was a spare breaker slot in my WFCO so I put the converter on its own circuit.
Next I tapped off a 120V outlet in the bedroom and ran 14ga Romex through a switch to a duplex outlet in the front pass-through.
There's now a deck-mount IOTA-55 w/ IQ4 mounted to the ceiling of the pass-through. It's a 3' wire run to the batteries on the tongue.
So - now I can run on either the WFCO or IOTA by turning each one on or off with the switch or breaker. The WFCO is still intact so I'm using the AC and DC distribuition on it. The IOTA is better for charging off a generator than the WFCO. And I have a back-up converter should one die.