As Aussieguy said, the ground panel will need its own controller, since that side connection is typically just wired straight to the battery.
Two things to check before ordering anything-- Use a multimeter to test the voltage and polarity on the side port. Often FR reverses the polarity on these to try to force you to buy the Lippert ground panels. It might also be a proprietary connector.
Also, make sure you actually get a voltage reading on the side port. You may find out as I did that it's not actually connected to anything.
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2021 Forest River Wildwood 171RBXL
Towed by 2018 Toyota Tundra TRD SR5
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