IA to CA trip planning

[Sleddog]

Highway 12 & 20 to Chadron/Ft Robinson State Park, you'll love the history & original buildings.
Wiggle your way to Ft Collins via some two lane roads.
Rocky Mountain National Park is great to ride through.
Take 40 to Provo, then 50 to Sacramento.
Coming home, head North & catch highway 12 & ride to Missoula. Head toward Billings on whatever roads look interesting (they're all good in Montana) Ride Beartooth Pass & Chief Joseph to Cody. Visit Buffalo Bill Museum.
Ride 14a or 14 to Sheridan, then on to Gillette via 14.