Planning Yellowstone/Teton Trip (from Iowa)

We hear that YNP is a little less crowded in mid-September so we're heading out after Labor Day from the San Antonio area. Will stop in the Badlands for 4 days on the way. One neat place we're looking forward to seeing on the way to the Badlands is the original Cabala's in Sydney, Nebraska where we'll do an overnight, that Cabala's has a full hoop-up RV park. Then on to Cody staying @ Absaroka Bay RV for 3 days. Looking forward to touring the world class museums there. Then to Fishing Bridge for 2 days and Rustic Wagon RV in West Yellowstone for 5 days. We'll do a day tour (or 2) down to the Tetons. Not to concerned with the state of Fishing Bridge as we consider any RV park "an adventure" and trust me, we stayed in some real crapholes. Going home via Las Vegas to donate any left over vacation money..... For any of you military folks, Desert Eagle RV at Nellis AFB in Vegas is a very nice park. Anyway to the OP, have fun planning your trip and safe travels. Google Earth is your friend in trip planning.