There is one tunnel. I don’t remember height restrictions.

They named this road for a reason - it traverses the top parts of the park and yes, it is full of curves and hills, but like Anne H said, it all depends on the length of your 5th wheel and how fast you drive. Take it easy and you should not have a problem. Keep in mind there are several other campgrounds on the route, so they built the road for access to them as well as sightseeing.

We pulled our 30 foot Airstream and made it safely. If you go carefully you should be ok depending on how long your 5th wheel is.