I have two 10-ga extension cords plugged into each other. One is 50-foot (10-3) and the other is a 25-foot (10-3) that stays with the trailer. i.e. total length from trailer to the 120VAC receptacle in the garage is 75-feet.
I do the same thing with another 50-foot (10-3) extension cord where my other trailer is plugged in. This plugs into a different 120VAC zone in the garage that has a different circuit breaker. My RV30A-15A long dogbone type adapter is located between the two 10-GA cables actually laying on the ground.
Doesn't drop my AC voltage all that much... Both my 13,500BTU A/C's works just fine. When running my 13,500BTU Air Conditioner and I turn on something else that is rated high wattage like the microwave it will trip the garage breaker.
What I do in both my trailers is use one of these RV 120VAC PLUG-IN VOLTMETERS. If the 120VAC Voltage is not within the GREEN SAFE SCALE then I will not turn on anything that is high wattage in the trailers.
Roy Ken
