Today in the mountains of Wv. I overheated my brakes. The first time in 60 years of driving. Nine to 13 percent grades were too much for the v10 to slow the weight of our Miramar 34.3. One grade was so steep the front bumper dragged at the bottom of the hill. Even using manual first gear and pumping the brakes to keep way under the speed limit was not enough to keep them cool. I let the rpm climb to 4200 them slowed to 3000 in first gear! Speed in the corners was 25 mph. My advice, be careful going downhill.
Just drove through there last week in our 35C Hurricane towing a Jeep on I 81 and I 78. The V 10 did fine even passing a few trucks going up, I found the key going down is braking early at the top as you crest the hill and the truck lane ends stay in the right hand lane and start braking before you pick up any speed. I actually found those trucks I passed on the way up would pass me on the way down which was just fine by me. Don't think I had any grades that bad though only 6-9% maybe a different highway. Only time I ever overheated brakes was in a car coming down Pikes Peak they basically pull everyone over half way down and measure your brake temp with one of those temperature guns and make you wait if you are too hot
2016 Thor Hurricane 35C
2010 Jeep Liberty
Were you using Tow/Haul mode? That has worked wonders for us. Basically, Tow/Haul mode allows the engine to do some of the braking for you by changing the shift points. Just tap the brakes to shift down.
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
Too bad they don't have exhaust brakes on gas engines, between the exhaust brake, tow haul mode & set the cruise control I rarely have to only tap the brake pedal, if I feel it's too fast tap,the brake & hit the minus button on the cruise control a couple times.
Danny & Linda
Sold our '13 Thor Redwood 36 FB
Currently RV & truckless