AZ to NV, UT, ID, WY, CO and NM

After ID and then your stay at Rock Springs, consider driving south through Flaming Gorge area and staying there before heading through Dinosaur, CO and down towards I70. Flaming Gorge is really beautiful and if your into fishing, even better as the Green River fly fishing in that area rates VERY high. But also research the dinosaur digs and locations for the area.

Also consider looking up Black Canyon of the Gunnison for a slight side trip as you'll be very close to your route in CO.

Montpelier KOA is a bit pricey but they had a nice pool.Back then (2012)I had my small A-frame Chalet popup and they put in a spot right next to a small stream. There's a nice Oregon Trail museum in Montpelier right at the intersection of the road to KOA and the main drag. They had people in period costumes and "scenes" you walked through I think with narration in the background. I enjoyed it. If you want to call it a day early at Rock Springs there's the fairgrounds that offers camping with at least water and electric. Nothing fancy but a gravel lot. You pay the caretaker who lives on site. Tons of sites that will all be empty but make sure the fair isn't going on when you are there. It's called the Sweetwater Events Complex. I even think they had wifi. At Meteor Crater RV park the exit road to the south (as they lock the main gate at night) is actually old Route 66. If you wander west far enough you might see some partial sections of pavement. If you take that gravel road all the way to the next exit west that is an area called Two Guns with some old ruins of tourism attractions. There is even remnants of what looks like an old KOA.

Circus Circus is just a quick overnight. I thought it would be an interesting departure from the normal RV park. Maybe go in, play a little *****. They have a good steak house too.

As for Kanab to 89, I've done that route before, just not with a 40 footer behind me. It is a beautiful area.

**Edit - lol, the profanity filter doesn't like the dice game where you're looking for a 7. :)

I would stay at a KOA only as a last resort: too pricey for what you get. I stay at the Oasis RV Resort in Vegas, very nice. The Circus Circus is just a parking lot. From St George UT I'd head east to Kanab then north on the 89 to intercept the 15, this is a very beautiful route in between two mountain ranges.