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.