I think I-80 is better than 1-70. We drive I-80 to Michigan 2-3 times a year.
I was just on I-29 to I-70 to Bowling Green--- via I-29 through Omaha/Council Bluffs and around Kansas City towing my enclosed trailer/with my 62 SS 409 Hardtop -it was easy except for St Louis traffic.
I-80 in Iowa, Illinois and in Nebraska are smooth roads
Less traffic west of St Louis(Tom's area I-70 ) and West of Omaha, Nebraska on I-80. Medium to low traffic in Western Illinois and across Iowa.
I-90 through the Black Hills, Mt Rushmore/Black Hills is something to see but its a fair amount north of Cheyenne.
I am 75 miles north off I-80 -from Omaha/Council Bluffs, Iowa --I am right off I-29 only 7 blocks Next to Sioux City, Iowa.
If you want to see 2 -62 impala SS 409 frame off Convertibles being assembled at the same time (one red/red and one blue/blue) -they are 20-30 % together now with motors in the cars.
I have a 2000 SF garage similar to Tom except all one level, with 4 - 62's and a 57 Hardtop.
Paul