[Closed] Towing Electrics - Vivaro

Can anyone tell me about fitting towbar electrics to my 2012 Vivaro? I was planning to fit a vehicle specific kit but the supplier has still not posted it, and now its not going to arrive on time . I have a universal kit (no bypass relay) and wonder if I should just fit that.

Anyone done similar? I don't know if the van has any specific tow settings/features that I might screw-up

(Although the kids are excited about using the little tents; a camping/biking trip without the trailer tent is not going down well with my wife!! SAVE MY MARRIAGE!)