Hicky ... I googled "cool tech harness" and found quite a few hits. You don't say if the connection question is to the tail lights of the Motorhome(?) or the vehicle you're towing. There seems to be variables depending on vehicles so it's hard to answer your specific question.
Lots of discussion about this on iRV2.com (see google hits).
Google HitsSafe Travels
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2008 HR Endeavor PDQ - Ford Edge 4 Down
FMCA F374292