Just took this route about 1.5 months ago.
The road winds around, but I did not notice anything out of the ordinary. Seemed like any other road that goes through pretty scenery.
I have a 43 foot Motorhome pulling a Jeep.
I would give the road a 3/10 in difficulty. For reference, Million Dollar Highway in Colorado I would rate 7 out of 10.
Sea to Sky highway north of Vancouver is the only road so far I would rate at 10/10 for a 43 foot RV, and I have been on the vast majority of good ones in the Western US.