Thanks all! Jim & Nicky I will PM you about those campgrounds along the way. Definitely not going to do the drive in one day so will need at least one overnight. Appreciate the advice.
cbshoestring (great username!) I know all of that to get back on 81 doesn't seem right to me, thanks for the tips on all the roads, you gave me a chuckle too!
And lbrjet - yes for sure it is summer and our vacation, I'll take a little traffic over a day of work! And we drove to CA on 80 last year and enjoyed it especially the further out west we went. We timed Chicago right (by accident) as we hit it on a Sunday morning so flew through. The way back was a different story though I have never seen so much construction and traffic it was ridiculous! ;-)
Thanks again all!