UTAH Hwy 89, 12 and 24

We drive this route almost yearly in spring or fall but we boondock in Escalante (in months when it's cooler). There's a RV park in Escalante along Hwy 12 that you'd fit and higher in elevation along Hwy 12 is Singletree national forest campground, previously mentioned by 4Runnerguy. It's very nice, in a pine forest, and you wouldn't need air conditioning there. Escalante has the most services along 12 except for around Bryce Nat'l Park - fuel, restaurants. It's a good place to park if you want to explore more along Hwy 12. Do go to Calf Springs. It's a beauty. The slot canyons out of Escalante are awesome. Some are short like Peek-a-Boo and Spooky, again, as mentioned by 4Runnerguy. He seems to like the places we do. :) There are plenty of RV parks in Torrey. I don't think you'd fit in Capitol Reef Nat'l Park. Hwy 24 is a cinch to drive.