UPDATE: Problem fixed! Thank you to all who replied. Carefully checked volts and amps all along the path from pedistal through cord (no extension cord, only the trailer umbilical), transfer switch, breaker panel to the AC unit. No unusual voltage drops noted (about a volt total end to end). Re-cleaned the condenser coils, straightened many fins that had been dented. Amps dropped from 18-19 running (cooler day than normal) down to around 14 and the unit has been running as it should for the past several days. Thanks again for all the expertise and professional advice!
