State Trailer Supply on mine.. Its suppose to be the latest and greatest thing.. Spent 140.00 something back in February on the Prodigy by Tekonsha..Its self adjusts and makes things easy for Dummies, felt this was right up my alley...That and I can swap it into another vehicle in less than a minute..
Also besure you get the adapter from dodge so you don't have to cut into any factory wiring, state trailer also carries this plug.. the factory gives you this when buying the truck so there should be one in your truck already.. I now have an extra
This plug makes it so you don't even have to crawl under the truck and mess with wiring..