We handled 16 over the big horns pretty well in our Thor Windsport towing a 4800 lbs mini van on a tow dolly. There is a steep grade of 6 or 7% for about 10 miles coming over the big horns from Buffalo to Cody. We had to pull over several times to let the surge brakes cool. Then we went from Cody to West Yellow stone and that was a piece of cake compared to the big horns. Safe travels and have fun.
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