I used this black sealant to connect the rear bumper (on my Subaru) and trailer wiring connector. It's a very sticky, slippery, muddy material, but once dry, adhesion was excellent. There are many different silicone sealants. I like this one because it's black so it matches my color scheme. Note that you can poke a hole in the tube to make it work using the back of the cap. It's a nice touch.
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