There is only a length limit if you are towing a 5th wheel, and that only says to use the shortest king pin position. I have run that quite a few times. You can do it, but yes, it is a tight road in a lot of spots. There are about 6-7 10mph turns that are almost 180 degree turns. Check this website and see for yourself -
http://www.milebymile.com/main/highway-373.html