There are lots and lots of spaces there. Remember to have your water tank filled as there is no water there. There is a dump station and electricity. Also remember that you will need a Colorado fishing license to stay there. You can get one at a nearby Mosca, just down the street. Have fun.

Plenty of spots here about 10 miles from the park. Free 30 asnd 50 amp hook ups but no water fill before you get here. You need to buy a colorado parks and wildlife permit about $10.23 x person for a year. The place is great spacious and good for big rigs.

We stayed here last year. July 2020. Loved it overlooking the sand dunes. I would take a chance. You do need a hunting or fishing license which we did NOT have but host let us stay for 1 night free. Our plan was camp at Zapata Falls(outside gates of Great Sand Dunes) but the road was very rough so we took a chance and San Louis and lots of space.(another option if San Louis is full). The night sky here is unbelievable. Here is our review so hope it helps. http://travelswithgg.com/hiking-the-great-sand-dunes-national-park-san-louis-recreational-area/

There are many campgrounds closer than 2.5 hours from Great Sand Dunes NP. If you must have hookups, find an RV park in Alamosa. And San Luis Lakes is not free. Everyone 16 and over must have a CPW pass or license to camp there. So, you should do what makes you most comfortable.

sorry just got the email you should be able to find a spot good luck safe travels

We were there later in the year, but I would expect you could find a spot, if you’re not real big, or real picky. There are quite a few sites, but there were several I am not sure our big rig could’ve stayed in.