WE ARE PLANNING ON A TRIP AROUND THE MIDDLE OF JULY TO THE ABOVE DESTINATIONS,LEAVING FROM DALLAS,TX. -TOO MT.RUSHMORE AND THEN ONTO YELLOWSTONE. INFO. ON RV PARKS AND ROUTES WOULD BE APPRECIATED.
We stayed in military FamCamps so unless you are eligible, I can help with that. We just left Rapid City at the beginning of the week and are now in Wichita Falls. We took the interstate I-90, 29, and 35 for the most part. That's not the most direct route from Dallas, but it's the quickest. A few years back we made the mistake of using an interior road thru Nebraska and it was horrible for RV travel. I think that was Highway 20, but no sure. Perhaps someone who lives in that state can clarify it.
You've gotten a bunch of good suggestions on what to do in both places. When in Rapid City, you might want to check out the two tour bus operators that do Rushmore, Crazy Horse, Needles, and Custer State park. They are all day tours, but beats having to do the driving yourself.