Where were you camping at? What was the outside temperature?
I have a 2016 27ft Jayco White Hawk and I live in Las Vegas. The temperatures can get over 100+ every day here or around Nevada. The AC I have is a 15,000 BTU Coleman Mach and my trailer inside doesn't get below 90 when the temperatures are that high. The AC can not keep the unit cool. The best my unit can do is about a 15 to maybe 20 degree drop in outside temperature. I have the darkest windows you can get and even extra insulation in the roof and slide. Also use foil on just about every window to reduce the heat entering the trailer.
We have purchased another portable AC and use it in the main part of the trailer to help with the heat. When we use it we can get the inside of the trailer down to around 78 or 80.
I'm not sure if your unit stopped blowing cold air or its running and just isn't cooling your trailer enough. ( I'm thinking you have air movement but no cold air.) The units don't have fittings to check to see if you have a proper refrigerant level. At least my unit doesn't. You can purchase fittings that will make a hole in your lines so you can check for proper charge. You can get them from Home Depot. Then if you have the gauges to check, that would be your starting point.
I'm no expert by any shape of form. LOL Just trying to help.