Try to get this back on track. You can add an after market brake controller or try and get a OEM controller added. I would prefer the OEM as they seem to me to integrate better. When you tap your brakes, the trailer will also brake and the trick is to get this feeling seamlessly, so they stop together and not the trailer stopping the truck. The OEM seems to be better at this, I think. The other things going on here are, look at the payload sticker on your driver door jam and get your payload. This will tell you how much your truck can legally carry, including passengers, hitch, and weight of the trailer on the hitch (Tongue weight). There are also some comments on if you have a tow package, which would add a transmission cooler among other things. May want to mention which motor and drive ratio. Good Luck!