There is a basic design difference between an automobile or pickup truck A/C and ones for motor homes, large trailers, and residential homes & apartments. The Automotive units are very large capacity in relation to the volume to be cooled. This is because people expect to be able to cool down quickly on short trips. When cooling a much larger space, it would be quite expensive to install and require a very large electrical supply to match auto performance.
In an RV application, you must use the A/C like you do in your home: Do not wait until the temps and humidity are already high before switching on, but start earlier so that the system is not overwhelmed by the heat and humidity.
I usually switch ours on at about 78-80 degrees, with the thermostat set for 72-74.
I would not be surprised that if you use this scheme, the dripping will stop.
2008 Itasca Meridian 37H & 2015 Flagstaff T12RBST
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months - Woo Woo
Yellowstone Lake 6-1-2012