If you are going to Duluth, I'd still take I-80 to I-35. If you are towing, staying on Interstates would be best even though you can save 180 miles by taking the fastest (in good weather) route.
If you are going to Duluth, I'd still take I-80 to I-35. If you are towing, staying on Interstates would be best even though you can save 180 miles by taking the fastest (in good weather) route.