We hit 86 today and it was humid after having gotten heavy rain in storms that lasted almost the entire night. My wife and our kids, plus a couple of their friends, spent the day at the farm while I paid for it. She said it was absolutely stifling at times.
The camper does have a nice A/C unit and thermal wrap layer to promote heating/cooling efficiency and, after today's weather, she seemed to think having a place get a little respite from the heat would have been nice. Might have been a solid selling point!