Not an expert, but from experience I have found that having a small fan to help circulate the air in the camper has made a difference in extreme heat. If your AC air was blowing 50 degrees it sounds like it was working.
2014 Fun Finder 276
2015 Ford F150 Ecoboost 4x4
2011Harley Road Glide Ultra
Trailers aren't insulated like a house. Lucky to get 20-25* reduction in temp inside when outside is more than 90*. The use of a fan really helps and can reduce inside temp by several more degrees since the 50* air from a/c is circulated more efficiently.