We just finished our trip out that way. We really enjoyed Hwy 14 if you like scenic drives. You did not say what you would be driving! If RV 14 maybe not so much, its very do able but you would not beable to take in as much of the sights.
Hwy 20 on the other hand is just a great Hwy!
Itasca Meridian SE 36g
Road Master Tow Dolly