Thanks everyone. Sounds like some of this may be past my comfort zone. I did try some of the suggestions, everything else off, different weather conditions, even different camp grounds... it still pops the circuit breaker after 30-60 minutes depending on outside tempature. Frustrating the previous owner separated the circuit breaker, 20amp, but originally the account was on the main circuit, 30amp. I'll have to get up top to see what unit is installed, may not be original.
Thanks again everyone. Great suggestions and ideas...