I've driven that road several times in our old 36' monaco dynasty, pulling a 20' trailer and all I can say is that since I don't even recall that grade, it can't have been too big of a deal. One of the prettiest roads I've driven. I do remember spending the night at a campground just on the u.s. side of the border, waking up in the a.m, going outside with a cup of coffee at about 6 a.m and standing there face to face with a moose who was wandering through the campground. I SWEAR he stopped and looked both ways before crossing 93. Now THAT was way more impressive then the grade for sure.
Have fun, you'll enjoy the trip.
Toni & Leila
2005 Country Coach Inspire 51431