wiring for a hitch cargo box and TC simultaneously?

mkish

Adventurer
My TC plugs into the 7 pin plug by the hitch. I want to use a hitch box that has lights and needs to plug into the 4 pin plug. My truck (2012 Ford f350) has covers on the plugs to keep them clean and both can't be open at the same time. (I don't even know if they could actually function at the same time.)

So basically I need an adapter or extension that goes from 7 pin to 7 and 4 pins.

Apparently my search skills are suffering form lack of vocabulary. This has to be a thing! Anyone know what I want?

Thanks!
 

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