I was also experiencing similar issues 30 Amp cord through dog bone adapter to 15 Amp GFCI. It worked for years without issue, then suddenly GFCI started tripping. It turns out that my dog bone adapter shorted out. So check all of the components. in the chain and never assume it is good.
The GFCI tripping is actually a good thing in that the protection devices are doing their job and not letting your equipment get cooked.
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2016 Cougar 1/2 Ton Series 283 RETWE
2018 F150 EcoBoost FX4 Lariat Max-Tow and Heavy Duty Payload Package
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