I pulled a 40' toy hauler that way 2 yrs ago to Marysvale UT and my Jeep on a trailer to Moab the year before that. There's a reason they call it the loneliest highway in America, there are some things to see along the way and I don't think it takes much longer and there are a few curvy sections, but mostly this...
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Favorite way to go. Taken all the main ways and this is my favorite. Taken it the last 2 times and just enjoy the road. Can just cruise and enjoy seeing what the landscape looked like hundreds of years ago.