I feel your pain. Still working here too.
We did a X-country trip this year to the places you plan and quite a few more. It was 4 weeks plus a couple days. We put 7,600 miles on the MH. Most of those were during the 2.5 days out and 2.5 days home.
I hated to burn all that fuel in such a short trip, but we wanted to get the kids out there to see as much as possible before they got into the teenage years.
We did a day trip to the GC, so can't help you there. We left Monument Valley, stopped at GC and overnighted with family in Kingman, AZ. Hated to cut that leg short, but we had a wedding to attend in San Clemente, CA over the 4th of July weekend.
X3 on Grizzly in West Yellowstone. Great campground, great little town.
We stayed at Yosemite Ridge Resort in Buck Meadows NW of the park. It was a little too far of a drive into the park, our site was tight, and off level side to side with a soft mix of dirt and stone. What a pain.
Since we were moving often, I reserved in CGs that looked like easy in and out. This was the only one we "missed" on and really not by much.
I don't know about other routes into Yosemite, but I was glad we didn't stay in the park when we drove the Toad in. There may be a better route in or more CG choices along the other routes into the park. We chose our CG based upon leaving Sequoia, hitting Yosemite and crossing Nevada to Yellowstone.
Hey, it's only gasoline and this was, most likely, our only shot of taking this trip until retirement, hopefully, someday.
Chuck, Heidi, Jessica & Nicholas
2013 Tiffin Allegro 35QBA