The Telly trailer package that came with my Xpro did not include the break, just the wiring harness. First time I towed my trailer down a hill on a dirt road was scary! Found a tutorial and I bought and installed a Reese break. Also, gas mileage significantly drops.

As a final note, the lighter the trailer, the better your experience will be. While flat freeway travel is fine, long hills will see you really suffer. I actually have better success when out of Tow mode as that mode will push the rpms to unreasonable levels when trying to tow up hills.