These AC units are not real powerful. Especially the 13K unit that is included as standard. You can measure the temperature differential between the air in and the air out. As I remember it should be about 20-25 degree difference. If so, it is working normally. Also, if you have ceiling ducted AC, slide open the louvers on the unit, this will allow more cooling into the main room. Lastly, turn on the AC before the trailer gets too warm.
2015 Jayco 27RLS
2015 Ford F250 6.7PSD