Well, it might help to get to a 30a connection so you can eliminate simply overloading the feed receptacle at the house.
GFCI's can trip without much warning, so first try plugging into a non GFI receptacle. Your 110v waterheater element is in the tank - you'll see it inside the door. They're about 11 to 13amps, so should feed off your 20a standard receptacle without issue. It is entirely possible the heating element is fried/corroded, but they are cheap and easy to replace. They're about $20, and probably worth just replacing it.
Good luck and have fun out there!
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Chris Brown -
2005 Itasca Sunrise 31W - W20 and 8.1
2021 Chevy Spark Toad
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