I don't have a 30x3 but all motorhomes have a breaker panel. The microwave should have a break switch for it and may be one other receptacle. The TV should be on a separate breaker. Most breaker panels will have a brown cover that when pressed will pop off. Look for two breakers that are tripped. It may be hard to tell which ones are tripped so you may have to switch each one off all the way towards the lower part of the switch and then up until you hear a click.
Your problem is not unusual but should not happen very often if at all.
You may even have a GMCI receptacle that has tripped. Look at those also.
2013 Georgetown XL 378
2008 Honda CR-V