If by "Large plug" you mean the longer slot... NO, that is wrong.
Should be short to round and long to short both show power
Tripped breaker,,,Tripped GFCI...Bad connection up-line from or inside the non-working outlets...Screw loose
Many RVers have a few screws loose...I found several loose screws in my 120 volt power distribution panel. My power INLET (The thing I plug my shore cord onto) and in two different cases on the shore cord OUTLET (The part that plugs into the inlet).
Real good quality control.
And I am not an RV technician so I do not see all that many rigs.