There are no restrictions on 128. We have a second house in Castle Valley which is off of 128. I’ve driven the entire route without an issue. Heck, they drove in both sections of my modular house via 128.
Now, the road can be a little narrow at times. And, it’s twisty. Just follow the posted speed limits (especially in the corners) and you should be fine. It looks like you have a Sprinter based RV, so it shouldn’t be a problem. I regularly see 40 footers on the road.
Of course, I’m biased, but I think it’s one of the most scenic drives anywhere.
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