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Check any outside or wet area GFI supplied outlets for water intrusion. High humidity can cause GFI to pop even if there is no connection with a dirty or contaminated outlet. Salt spray is a good way to cause contamination. If you have any outside outlets, disconnect ALL shore power and shut down the inverter completely, open the outlet covers and look for signs of water droplets, corrosion, or carbon tracking (black marks) near the terminals. Pull the outlet from the box and use a bright light to examine it. Note that on a three-prong outlet, the narrow blade is the hot side--examine it and its terminal area carefully for any signs of a path to the grounded parts of the outlet--the metal bits connected to the shell or the green ground (safety earth) connection.
A minor amount of moisture will trip a GFI and it will then on refuse to reset...its also sometimes possible to blow the affected outlet out with dry compressed air and maybe resolve the issue.
SAFETY NOTE: Fix the problem, do not attempt to bypass the issue or eliminate the GFI breaker or outlet--it's there to protect life. An Airstream is a metal can that can provide a solid path to ground should you contact the hot side of an outlet. The GFI is designed to detect that issue, and cut off the power on the circuit before it fries your butt...and believe me, electrically cooking yourself is a lousy way to die.
Also verify, with a good multimeter, that neutral (white wire) and green ground (safety earth) are NOT connected together in the Airstream somehow. This will also mess up a GFI...disconnect power before you check this. Your shore power cable could be causing this issue if it is old, worn, or damaged...
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Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it. 
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