On residential a/c you are looking for 18-22 deg difference in supply and return air. There are other factors to consider, but this is a good rule of thumb. The condenser temp is normally 30 deg rise across the coil.(harder to measure on RV) this also has other factors to consider. In my minimal camping experience if you set up in the middle or late afternoon sun(hot weather of course and 90 plus) it's gonna take a while to cool. The a/c units that are failing due to manufacturing defects...It is hard to tell failure from hot ambient. Check the temperature fall on the coil, keep all the filters/coils clean, run on high speed, limit the open/closing of the doors, try not to cook inside(baking/boiling stuff), use fan to assist in air movement, do not block air flow, keep interior doors open for air flow(where possible), cover windows with something when possible and any other thing you can think of.
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