Trailer Wiring

Ok I've owned a trailer repair facility for over 10 years so I'm an expert when it comes to stuff like this. Ok first off did the van have any OE wiring for the trailer? I'm 99 percent sure it didn't but it varied on some dealer models. First off find what they call a T-1 connector from either curt or drawtite. That will give you a harness that T's into the factory tail lights. That will give you a clean unspliced flat 4 in the back. Now there are adapters to go from 4 to 7 but the electric brakes and 12v will be inactive. I'm not sure what you are towing but no dodge vans that year came factory with a tow package giving you all 7 wires In the back with an OE 7 way like 2000 and newer trucks. If you are lost shoot me a pic and ill let you know what you have.