Numbered state highways are nearly always decent paved roads, in my experience, suitable for most any vehicle. There are a few exceptions here and there, of course. I don't have personal experience with these particular roads; but I would not give a second thought to planning to travel over them with my class C.
With a few spot checks in Google maps street view mode, they look like ordinary decent two-lane paved roads, with some areas of rather nice looking scenery and some towns that might require one to slow down a bit.
