Many Heartlanders crossed the Wyoming Bighorn Mountain range in 2013 with the National rally in Gillette, Wyo. and the 1st Wyoming chapter rally in Cody, Wyo. a week later. I overheated my transmission, others blew out turbo hoses. Hwy 16 West from Buffalo is what we took based on bigger horror stories for Highway 14 to the North. Both passes are 2 lane roads over 10,000 feet at the summits. With unlimited time and pocketbooks you could go North into Montana, or further South in Wyoming to cross the Bighorn range at much lower altitudes. On the other hand, about 20 Heartland 5th wheels made it across the Highway 16 summit to Cody. But this was in late June, also.