Out of Durango take 160 west to Cortez then I think it is 491 to Monticello then 191 to Moab. From Moab you have a couple options. Head north to I70 and west to Green River at this point you need to make a choice. Just west of Green River you can take 24 south to Hanksville and go west on 24 to Torrey (you will pass though Capitol Reef National Park). And then at Torrey you can also make a choice head south on 12 to Boulder, Escalante and onward to Bryce 12 is one of the prettiest roads anywhere. However some seem not to like it due to its 15ish mile stretch or so of twisty, curvey, narrow shoulder experience. The road itself is fine and the scenery is just great. However if you arent in to that at Torrey you can contiune on 24 to Loa and beyond to I think it is 62 then south to Bryce (there is a cutoff called Browns lane headed to Koosharem that will save you a few miles and cut you over to 62). 62 later turns into something else then into Johnson Valley Road it will put you right at the entrance to Bryce. All beautiful decent road. The other option back at Green River is to stay on I70 headed west to hwy 72 take that south to Loa and Highway 24 at Loa then as above from there to 62. 72 is a good road with little traffic. You also have the options of staying 70 and getting off at 24 then south to 62, or staying on 70 to hwy 89 to 12 then east on 12 to Bryce. Green River west on 70 is also a very beautiful stretch of Interstate up through the San Rafeal Reef and across the San Rafeal Swell.
From Bryce 12 west to 89 south to 9 west at Carmel Junction will put you into Zion. double check the Zion Website for the Tunnel Restrictions but I think you should be ok. If not you will need to cut across somewhere north of there like Panguitch and hwy 20 to get over to I15 then south to 17 and then 9 into Springdale west entrance to Zion
Weather Moab and Zion very warm to very hot high 80's to low 100's. Bryce will be 70's to 80's.
Campgrounds Bryce Ruby's Inn has a large Cg but I would make reservations. I doubt a 43'er will fit in any of Bryce's Cgs. Zion park more than likely full but check out area Carmel Junction and on west side Springdale again though not sure I would wing it there call now for reservations. Moab many to choose from but once again very popular might want to reserve though there are areas for boondocking but this time of year might be sketchy just rolling in hoping to get a spot.
2016 Jayco 28.5 RLTS