7 Pin Trailer plug holster
thingiverse
I've had a number of trailers that use the 7 pin plug and when parked the plug hangs on the ground and ends up getting corroded, then doesn't work properly. This has some holes for mounting, a tapered hole in the bottom to allow any water drain out, and keep the plug up off the ground. There is a little lip to hold onto the plug so it kinda snaps into place, at least with the plugs I have. There is an OpenSCAD file to customize if you want, its really ugly code though.
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