You are going to need to install a 7-way trailer wiring socket on your vehicles (the 2015 Silverado already has one), so that you can activate the trailer lights and then install a brake controller to activate the EOH brakes of your trailer.
You will need to start with a 4-way (if you do not have one). For that you would want the # 119250KIT.
From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller... view full answer...