A little trick I saw today in trailer life magazine that I thought was clever. Rather than leave the 7 pole wire from your camper just hanging when not connected to your tow vehicle you can mount it using a Mag light D cell flashlight mounting bracket. Brackets only cost around 6 dollars. Here is link with the picture of the bracket http://www.amazon.com/MAGLITE-ASXD02.../dp/B00002N9ER
I use appropriately sized PVC pipe unions (with a screw through the wall) and broom handle clips to mount Mag-lite sized and "Tactical" lights all over the rig.
A flashlight is never out of reach.
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Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL