I have never been out there, but have spent a lot of time on Google Maps scoping the area out.
There is an RV park in Ignacio, south east of Durango, 24 mile drive says Google Maps, it is at the Fair Grounds, has full hook ups and is $525 per month with a $100 deposit. This campground is on Southern Ute tribal land and according to Campgroundreviews.com is closed. I would make phone calls if you are interested and see if they may be reopening it in the next couple of months. The tribal lands have been very tight on Covid-19 restrictions.
There is only one review on Campendium and it is one star with the only comment being "month to month only" which according to the web site is not correct as they have daily and weekly rates. The reviewer gave no other info, so I have doubts about the review and would not depend on it.
Go to https://www.campgroundreviews.com/regions/colorado
and zoom the map to the Durango area to see all RV parks and campgrounds in the area that have reviews.