The frame connector for portable panels *usually* go directly to the batteries, requiring the portable panel(s) to have their own charge controller...which they usually do, often mounted on the back of the panels. Check your manual to confirm all this (that the connector goes right to the batteries...you should be able to tell even by just looking at what is wired to your batteries, and be able to located the wires from the connector).
For the previous factory panel installation, the charge controller would likely be located wherever your 'rat's nest' of wires are located...usually near the front of the trailer, on your basecamp somewhere under your galley equipment. This is where your wires from the batteries and the umbilical 7-way come in to the trailer. I wouldn't be surprised if the PO just removed the panels and left the controller, but confirm that obviously, and make sure everything is in place and hooked up.
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