I would take southern route out and northern route back. For full hookups we like most KOA's. Don't miss: St Louis - stay outside city and drive in. We like the KOA in Eureka MO for St Louis. For next stop there are KOA's in Springfield MO and Joplin MO. If you stay at Springfield, don't miss the Fantastic Caverns. Ride thru on jeep. Then I would drop down and go through Ft. Smith Arkansas. Don't miss the visitor center and trolley museum and trolley ride. We stay at the Springhill Corps of Engineers campground in Barling AR. On your way thru OK, worth a short jog to Red Rock Canyon State Park. Then Oasis RV Park in Amarillo TX is where we stop. Take a side trip to Palo Duro Canyon state park. Not many places we like in Albuquerque so we stop in Gallup NM at USA RV Park. Then Grand Canyon. Haven't been there in a long time so maybe others can recommend where to stay. Don't miss the Tetons before you head to Yellowstone. If you can't get in Yellowstone campgrounds, we stayed on the east side at Yellowstone Valley Inn. Also don't miss Cody WY after you leave Yellowstone. Buffalo Bill Museum. There are also state parks along the Buffalo Bill reservoir but most don't have hookups. As you head back east, check Roads and Routes. There is one road the forum members told us to avoid but don't remember. Think it was US16 between Ten Sleep and Buffalo.