Depending on your exact routes, you may find these Westy road trips helpful:
http://campwestfalia.com/camp-westfalia-journeys/

In particular, our trip from Wisconsin along the Great Northern Route of US
Highway 2 to Glacier NP may give you some ideas for your return trip:
http://campwestfalia.com/great-northern-roadtrip-day-1/

If you need any kind of support if/when passing through southern Wisconsin,
drop me a line.

Have a good trip!

Jeffrey Lee