My horse trailer salesman told me the installation of a brake controller was very easy to do. My two previous pick ups have had one but this one doesn't and needs it. I took it to the dealer the other day and they quoted me $300 for the brake controller, and installation. That's the highest I've ever heard. Is the installation really simple enough that I could do it myself or was that salesman hype? I can get a controller for around $100 - $120.