Re: Elk Meadows Resort. It is owned by the same company that owns Spruce Lake in Estes Park and Dakota Ridge in Golden. But between the two in Estes Park, I prefer Elk Meadows. The sites are laid out on a bit of a sloping hill, so if possible, try to get a site that is at the top of the hill and more to the south. The picture in my siggy is from Elk Meadows, site G15. The G sites are all 30 amp so if you can get by with that, I recommend G14 through G10. If you need 50 amp, then sections A/B/C and F are the ones for 50.
H E R E is their map. I also prefer the restrooms at the top of the hill, there are 4 of them that are unisex, sort of like being in your home bathroom, with privacy and very clean showers, if that matters to you.
Since you're looking to do all of the 4 NP that you mention, to get the 58, I'll offer this suggestion. You'll only need 1 night at Great Sand Dunes. If you leave Estes Park early and go directly there, you'll have a goodly part of the afternoon and evening to see the Dunes and play in Medano Creek at the base of the Dunes. There's a CG in the park (Pinon Flats) as well as a commercial CG just outside the entrance (Oasis CG). Since you're in the MH, the 4X4 trails aren't really doable (!!). Yeah, one can spend more time there, but in the grand scheme of things, you'll probably enjoy Mesa Verde more that GSDNP.
I have not been to Black Canyon of the Gunnison since it became a National Park, so I'll not comment, since others have.
Mesa Verde has Morefield CG inside the park, and several commercial parks outside. I've stayed at Morefield and loved it. But then, I'm partial to staying inside the NPs. If you check the RVparkreviews site, look for Mancos in addition to Cortez for listings, or just Google "Mesa Verde Camping" and you'll come up with the same parks.
Mesa Verde is also deceptively large, with a LOT of driving between the various locales to visit. Most of the major venues are in the extreme southern park of the park. Parking could be an issue for your MH at some of the sites, as they are very popular. There's also fuel inside the park at the Morefield CG. There's a tunnel, but the height is 20 feet, so that won't be a problem. However, you won't be able to take your MH on the Wetherill Mesa Road as there is a length restriction of 25 feet; there are sharp curves and steep grades. Rangers do patrol that road (or did when I was there last), and enforce the restriction.
Hope you have a wonderful trip to our beautiful state!
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