Here's an old post of one of our more recent visits to a National Park in New Mexico as well as a State Park (even a BLM Campground).
Santa Fe & Bandelier Nat'l Mon't area of New Mexico -A Trip Report 2012.
Los Alamos is a very neat small city in itself. Free bus system with very neat buses. Very pretty setting up in the high country. Somewhat of a gated community as well. We only drove through & stopped at a SuperMarket. A nice town.
http://www.visit.losalamos.com/http://www.losalamosnm.us/transit/Pages/default.aspxOh, yes, in most of the western states, even in the hot southwest states, normally one does not to run the A/C at night to cool off. It usually cools down greatly at night out this way. Higher elevations & low humidity are factors. Therefore, one does need to have electrical hookups as one does back east.
In parks like Yellowstone & the Tetons, it is even less likely to need them. Maybe to keep warm would be nice at time however. Ha!
The last 2 visits to Yellowstone was in July (2010) & Aug (2009). We stayed at Mammoth CG in 2009 & Grant CG in 2010. We have been 4 times all together & never had a reservation. Madison, Canyon, Bridge Bay as well as Grant & Mammoth CGs all should be places to consider. However, you would have to check the park web site to make sure about the 40' rig. Mammoth has some site which would work. There were really large rigs there.
South entrance via the Tetons is the easiest route into as is the North entrance by Mammoth. West entrance would be easy enough, but take a lot more driving to get around to it. East entrances one will have to do some climbing.
Here's an older post with info from our past trips, etc.
DesertHawk's Recommendations for Yellowstone Area.
"West Entrance - Adjacent to the town of West Yellowstone, MT, the West Entrance is open to wheeled vehicles from late April through early November, and to tracked-oversnow vehicles from mid December to mid March."
"North Entrance - Near the gateway community of Gardiner, MT, the North Entrance is the only park entrance open to wheeled vehicles all year. "
Opening & Closing Dates of Facilities What I have on
Sights & Sites between ABQ & Yellowstone (plus many others such as Black Hills/Rushmore). Santa Fe has some neat Must See & is on the way from Cody or Moran. IMHO.
I'd not want to do the drive from Cody into the Park more than once. It's a long drive & once in the park slow. It is closer to get to Moran by about 10 miles as well. Still a good drive from the Tetons into Yellowstone proper. Might not be too much difference between the drives in distance, but more mountain to cross via Cody.
Cody is a neat town. Might consider checking out the Thermopolis, WY area as well. Should be on your way to Cody via Casper. Pretty easy route from Casper to Cody by the way.
PS: New Mexico schools & I believe most if not all the states you mentioned schools will be starting in mid-August as well.