Moab to RMNP

As to RMNP, route depends on which side of the park you want to be.

East/Estes Park side is far more popular, and waaaaay more crowded. Reservations inside the park are a must at Moraine Park and Glacier Basin, the 2 most popular in-park campgrounds. Use the reservation window rapidly, sites book quickly. Commercial campgrounds will also require a reservation in most cases throughout the season.

West/Grand Lake side is not a popular, and a lot less crowded. Not to say there aren't crowds...there are. Just less than the Estes side. And the only in-park campground is Timber Creek, which is very nice and is first come/first served all season - no reservations at all. There are also some very nice commercial campgrounds just outside Grand Lake, and quite a few USFS campgrounds around Lake Granby and Shadow Mountain Reservoir.

As to routes, some of the routes mentioned above from other posters will work just fine. A slight modification here and there gets you to the west side from Moab. Unless you're a skilled/experienced mountain driver, I DON'T recommend taking Trail Ridge Road between Grand Lake and Estes Park or vice versa. Even with the caveats about no shoulders, and extreme drop offs, over the past several years the increase in popularity and thus traffic has been insane. It's getting less pleasant in a SUV or truck, never mind in a big rig pulling a toad. Pick a side, stay there, and use your toad to go between the two.

If you want to head east on I-70 from Moab one way to Rocky is to take Hwy 13 at Rifle, CO (Rifle Gap or Rifle Falls are nice state parks if you need to stay a night). Take 13 north to Craig, CO and east on Hwy 40 to Granby and on to Grand Lake (nice camping) and then take Trail Ridge Rd. from the west into Rocky Mtn. Nat'l Park. Be warned that it's a steep drive but many RVers do it. We have. It's all a very scenic drive and you wouldn't have the Denver mess to plow through.

Someone mentioned construction and delays in Arches Nat'l Park and yes, the campground will be closed all summer and there will be road delays. However, there are plenty of places to stay in Moab (Dead Horse Point State Park at Canyonlands is very nice) along with many RV parks. Plan to get to Arches by 7 am or even earlier for your touring. It would be a pleasant time of day. Also, if you can make reservations, the ranger-led 'Fiery Furnace' hike is awesome but very popular so get reservations early.

Have a great trip!

Here is Arches' web site where you can read about the 2017 construction project and other helpful information. Each national park has a great web site so check out Rocky Mtn., also.

https://www.nps.gov/arch/index.htm

I would call your attention to two routes:

1> Stay on I-70 to Central City, then take 119 North to Nederland then 72 to 7. This entire route is designated "Peak to Peak Highway." It is a favorite drive of ours, even though it is far from straight and level.

2> The second route would take US 50 from Grand Junction through Gunnison and over Monarch Pass, then up to Buena Vista in the Arkansas Valley. You could even make a "spur" down to Ouray, then back up to Montrose to rejoin US 50. Many great places to stay along this route: Ouray, Black Canyon of the Gunnison, Gunnison itself, Buena Vista. From Buena Vista I would take 24 on up to Leadville (another good stop) then 91 to join I-70 and over to the Peak to Peak as above.

The second route is very scenic and has many possibility for campgrounds.

Plan for delays around Moab due to major road construction around Arches National Park next year.