I have a newer 2020 domestic A/C, which runs fine. However, the last couple times camping trips, it seems to not start up correctly once in a while. Usually, it runs fine cycling on and off as normal....
Is the temperature in the TT actually above the thermostat set point or are you going by how it feels? If it has not run for a while and you are starting to get active; it may feel warmer than it actually is.