I need to add a trailer wiring harness to my PM 2500 Chassis Cab. The Mopar OEM harness for the chassis cab (82214282AD) is about $300, which seems crazy, but I just spent some time going through the installation guide online, and it seems thoroughly integrated into the electrical system. It looks like a second party harness would be less than $100 (still kind of pricey for a few pieces of wire and connectors). I kind of want to go cheap, but I also want it to work perfectly, be easy to install, and not void the warranty. I'm wondering if $300 is worth it, just for peace of mind. The Chassis Cab has different rear lights than the van, so that could add complications. Any suggestions?