We did a loop thru Utah 7 months ago, but we stayed in Torrey for 4 nights and made day trips. One of those day trips was 100 miles down to Bryce down Scenic 12 and back.
We went down scenic 12 solo in a Tundra. The road is gorgeous, peaks about 8,000 feet elevation, we had to stop for cows in the road, and the pictures above of the "hogback" really don't do it justice.
No way would I pull our 31 foot TT down that route. I have 7,500 miles under my belt with the rig but still consider myself a newbie. However, we did see just about everything on the road, from large RV's to Harleys and all in between but that one section is not for the faint of heart. I didn't tell my wife, but I MYSELF held my breath thru those 2-3 curves.
On thing to consider is the time that it takes. With the traffic, curves, and hills, it took us about 3 hours to do 100 miles. In fact, we came back to Torrey up "Grass Valley" on 22, then 62 to Lola, then back to Torey on 24. Lola seems to have the only real grocery store in 50 miles, and it only took about 90 minutes.
Safe travels!