We drove pikes peak road and the Mt.Evans highway in Colorado all the way to the summits with our 2005 dodge ram 3500 4x4 with our Alaskan and all our camping supplies. The camper and flat bed setup adds about 3200 lbs.to the truck. Mt Evans at 14,126 ft. is just a little higher than pikes peak. We had no problem at all climbing or descending either mt. On descent I simply placed transfer case in 4 low with my lockout hubs in free position, then selected the lowest gear needed to allow for complete engine braking without hardly needing any use of the service brakes. On descent of Pikes Peak We arrived at the mid mountain mountain check point with completely cool service brakes.