We've traveled US2 a few times, usually once we get into Montana.
Lots of wildlife roaming across the roads out that way, and the odd time livestock, so be aware of what's in front of you and off to the sides. We saw mostly pronghorns on or adjacent to the roads in our experience. Cattle once.
Mike. Comments are anecdotal or personal opinions, and worth what you paid for them.
2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 Wrangler JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)