Hi Jeremy,
It sounds to me like there was a power surge that ran through your trailer and at minimum the fireplaces took too much voltage and blew. You can try disconnecting them from power for 15 minutes and then retesting them but it sounds like you most likely had them disconnected for a longer period of time. I'd be willing to bet other sensitive electronics (stereo, tv, etc.) could also potentially be damaged.
If they don't come back on then you're unfortunately looking a complete... view full answer...