Ron
I use to live in a little town northeast of Casper Wyo called Midwest. It was on hwy 87 from Casper to Buffalo. A road from Midwest through Edgerton went to Gillette. The road north from Casper is now I-25 that goes directly to Buffalo, but the road from Midwest is now 387 and goes to Wright. This road from Wright to Gillette is 59 and was a good Hwy and I would have no problem taking it now. Going north on 59 from Douglas through Thunder Basin should be no problem. I wouldn't hesitate to take it either. However you should know Hwy 59 is a long drive and the only town I know of on that route is Wright and it is not on 59. It also is not a very big town. This is over 100 miles and not much between Douglas and Gillette. Be sure you have plenty of fuel.
We are going to come into Wyo from Sidney Nebraska on Hwy 85 from I-25 and stay at BJ's RV Park in Lusk on the weekend of the 8th then leave for Gillette on the 11th. We are going to go north from Lusk on 18 to Newcastle, 16 to Morcroft, I-90 to Gillette. If your intrested you could come by Lusk and travel in with us.
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BC