Gboya,
Here is an alternate route. Take 1-17 north of Flagstaff to US 160. Head east on US 160 to Kayenta and then head north on US 163 (this takes you through Monument Valley which is a great trip). After leaving Mexican Hat, US 163 merges with US 191 north and that takes you through Moab. Stay on US 191 (follows I-70 west for about 25 miles to just past Green River UT) until the split with US 6 just north of Helper UT. Take US 6 north into Provo. I have done all these in the bus towing a trailer or tow vehicle and they are beautiful drives. The drive through Monument Valley is one of my favorites. Most of the roads are two lane but they are good highways. Pay attention to the descent into Mexican Hat (its not bad, but it has a 90 degree turn at the bottom of the hill). This route is about 35 miles longer than the western route.
