No intentions of insulting you but sometimes we overlook the obvious.
Did you check to make sure the AC power switch is turned off before plugging the coach into the 30 amp receptacle? My guess would be one of two things. Either something drawing a large load is switched on and trips the breaker when you plug in or the 30 amp breaker may be bad.
If neither of those the receptacle for the 30 amp service could have burned between poles causing a sort.
I am assuming you have had the coach plugged into shore power at a campground or the dealer without issues and there is no reason why plugging into 30 Amp should trip the breaker if both AC units are off.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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