Yes, assuming your 2015 is similar to our legacy coaches it should have a wire bundle under the dash for a trailer brake controller.
They are difficult to find. It was under the dash to the left of the steering column tied back above the diagnostic connector set.
It has 5 wires: blue, red, & white stripes down one side of the connector; and black-white stripe, yellow-black stripe down the other side. My connector has "66" written on both sides with a sharpie.
Start reading at post #17
I used a Tekonsha Prodigy brake controller and am very happy with it. It is a true proportional brake controller.
I replaced the original 10 amp fuse with an auto reset circuit breaker that fits into the ATC fuse slot.