We are planing a trip from ABQ, which we will fly into and pick up a RV and drive to Gracier National Park. Taking in Monument Valley, Grand Canyon, las Vegas, Yellowstone and Gracier. Sorry for misspelled words. Time given to the trip is two to three weeks the week after labor day 2018. Any information would be useful.

Do you know of a RV rental company that allows the return of one of their rentals more than a thousand miles from where you rented it? Don't think that you will be saving any money by using an RV of any type vs. staying in motels and using a regular rental car.
The tourist season at Glacier NP is pretty well over after Labor Day. What do you want to see in Albuquerque or Las Vegas?

I would do it in reverse. Glacier first, southwest last. Weather may be a concern.

I know for some people the adventure is camping, but for the amount of money you’ll end up spending, never mind motels. You could stay in decent hotels or park resorts the whole trip and have a lot more flexibility and spend the same.

you need to book ASAP if you do want to camp. Don’t assume that after labor day is low season, especially in the Southwest.

And lastly, have you google mapped this, because that is a LOT of territory for 2 weeks. It might be better if you substituted Colorado or Utah for Yellowstone and glacier. You’re so close to Utah as it is, and the NP options are numerous and fantastic.

The Going to the Sun Road (which connects the east and west side of Glacier National Park) has vehicle size restrictions because of the tunnels and narrowness of the road. This is one of the most scenic drives in the country and you wouldn't want to miss out:
Going-to-the-Sun Road in Glacier National Park