Yanking my 4000lb trailer out of Osoyoos on #3 Eastbound,
with a 429/C6, 2.75's, truck fully loaded with 3 people,I slowed to 68 kph & maintained that right to the top of that 15 mile hill.

Driving the T/C (#1) around the snow sheds to the summit either direction I haven't any problem keeping at 110 Kph...buty the Max speed limit is 55.

The last time,I went to Van via the Coq, I didn't have any problem staying at the Max speed limit.
as Michelle often says: "That Truck knows no weight,it will pull again without any problems"