Md to South Dakota in July travel help

I don't know whether Busskipper intended it so, but when I bring up the map in his link it takes you up I79 to the PA Turnpike just beyond Pittsburgh and then to I80 across OH, IN and on south of Chicago. Based on past experience, I would not go that way. First, I80 across OH and IN are toll roads an there are a couple of additional tolls south of Chicago on I80. Second, I80 south of Chicago is a traffic nightmare. in 2016 we made the mistake of coming home down I39 in Wisconsin to head east on I80 to I65 south. I80 south of Chicago was a crazy white knuckle drive. We were so happy to finally escape onto I65.