I trust the Brakes on MY personal Truck and car 100% ... Rental Cars & 4 wheel drives , NOT so much..
If you got LOW Rock Climbing gears, its not an issue , but it is a very steep Grade . NO ? and btw since you from PA , I used to ride at Paragon, back in the day... they had some steep ones, as you probably recall. Those did not scare me ., again, i was on a Bike with Brakes I maintained personally..but on the downhill side that one hill as you know you just rode it out, there was no such thing as Applying the Brakes ,that would have been suicide..
Sorry for off topic .. just using as a reference ..