My first quick question is are you just plugging in to a standard 15 or 20 amp plug/circuit in say the garage? Are you running the trailers AC unit on said circuit.
To be safe you should have a dedicated circuit for a travel trailer, minimum 30 amp, 50 amp is nicer, using a heavy duty RV type, as short as you can, extension cable.
Let us know.
-"You want to make it two inches - or, if you're working in centimeters, make sure it's enough centimeters for two inches."-Red Green