Trailer Plug Holder Parking Cover Accessories Durable Fit for Car

Screw this dust plug adapter holder onto the trailer, after parking the trailer, plug in the 13 pin plug, 13 to 7 pin adapter, or 7 to 13 pin the hook adapter plugs into the socket. You can screw the trailer adapter plug holder to the tow bar, really practical and useful trailer accessories, nice choice for you.

eBay