50amp to 30amp newb question

My list of high current devices is: AC, second AC, electric coil in water heater, microwave, toaster, iron, hair dryer (on high draws more current than anything else in the list), and battery converter for the first 10 minutes after being plugged in (draws upwards of 10 amps initially, but slows down after a few minutes to a few amps). My 15K AC draws 11 to 13 amps--second AC is usually smaller and may draw less current. I believe that 2 ACs may be run together on 30 amps if the converter has been given 10 minutes to slow down, and nothing else is run. Fridges on electric should draw about 3 amps and not be a problem. Current trailer has one AC and we have no problems just by limiting to 2 out of the high current list above. We turn the water heater electric off when on 30 to allow use of other stuff while the AC is running.