New to the board but not to road trips. We usually drive every year to Disney but have not ventured farther west than Michigan. We live in eastern PA and are looking to take a road trip out west. However, we're not sure how far we can go round trip in 2-3 weeks and still be able to enjoy the sights. It's just me and the husband and we're looking at Yellowstone, Tetons and Mt. Rushmore. Not sure what else to see or if we would have time. We are used to long drives (500-600 mi/day, sometimes longer).Time of year would be Summer or early Fall. Any thoughts/ideas are appreciated.