Take time to read some of the reviews - this is one of the more highly reviewed campsites on Campendium so there is lots of good information here. There are always a good number of people here, but they come and go on a daily basis and it is a pretty big area so finding a place usually isn't difficult, though many are better than others. I was there last September and enjoyed it immensely as most people do. As for your camper...it all depends - you'll just have to work with it but some source of heat is always a good idea. The thickness of the walls/floor, the amount of insulation, the weather/wind, the number of slides you have, and how well sealed they are, etc. Covering the windows with silver reflecting insulating panels can help a lot. Hope this helps.

I'm sorry it took so long to get back to you, this went to my junk email. This is in South Dakota, so by late Sept. the weather is changing. A freeze is always possible. RV's are not well insulated, so make sure the LP gas heater is in good working order. You can contact me at rvdoc40@gmail.com. My wife and I have been full time RV living for over 20 years

We were there July 1 through 4 2019, didn't get cold infact had to use the solar power to use the AC. we were 1 OF 7 camper in about a 2 mile area. NO CROWDS HERE. Hope this helps, and you are only about 2 miles from the gate od Badlands NP

Relatively crowded as other have said if you want a place next to the cliff edges. Heat retention depends on your rig but please understand that is generally pretty windy on the ridge (winds from the West) and winds can range from 10 mph up to 90 mph with storms. Last year just before July 4th for the first time a 5th wheel was blown off the ridge edge a couple of 100 feet down the cliff. No one hurt but camper destroyed. Heavy thunderstorms in the area.

It was crowded beginning of September, and yes, RVs can get cold depending on their insulation. Most have propane heaters.