When it comes to camping within Mesa Verde National Park, Morefield Campground is the only game in town. As noted by at least one other reviewer, the road from the park entrance to the campground can be challenging as it winds its way around the monolith that is the first prominent geographic feature reached once in the park.
Though the campground operator makes reservations, once in the campground site selection is first-come, first-served. After driving through the loops available for RVs and travel trailers, we selected a camp site in the Waipi Loop. The site selected was just barely adequate to accommodate our 18-foot travel trailer, but it was fairly level, requiring minimal leveling of the rig. Sites are well-spaced and close to restrooms and freshwater supplies.
We visited Mesa Verde National Park in early June 2023, well before the height of the tourist season. The camp store has not yet stocked many of the items it would probably stock later in the season so we cannot comment on how well it will fit the camper's needs later. There is a Sinclair gas station within the camp store complex, with gas available 24/7, payment is by credit/debit card. The shower facilities, located in the same complex, are free and reasonably clean though the drainage system leaves something to be desired - water accumulates in the stall and on the floor of the changing area.
We recommend Morefield Campground to visitors wishing to camp near the ruins. It is still another 15-20 miles from the campground to the ruins and museum. We encountered rain on each of the three nights we stayed so plan accordingly.