WY 220/287 is a decent two lane hwy. Pulled my 32' fifth wheel over over it two years ago, the first week of October, from Casper to Rawlins. Nothing like Hwy 49 north in Cali. If you get a chance, I have heard that the frontier prison in Rawlins is a good tour if you have time and can find a place to park your rig.
Happy trails
Richard
2018 Ram Laramie Mega Cab Off Road 2500 4X4 6.7 CTD and a Super Gluide hitch
2008 Jayco Eagle Super Lite 30.5 RLS