[dug224]

UPDATE: "Second problem that still exists is the compressor cycles off after it starts cooling and does not come back on."

Turns out, the AHU mounted thermostat is bad/out of calibration OR the sensor is in a bad spot. Was getting supply air temps in the lower 60's. Wired around it and added a manual switch to confirm and to be able to use it until final repair. It dropped supply air temp to 48 degrees F. Plenty of cooling for the cab even on a 90 degree sweltering hot day here in Alabama. Got an email in to Southern Rods explaining my problem. Regardless of their fix, I'll still have to lower the AHU to repair and should be able to do so without blowing the charge.