Electrical System Question after Fire in RV Park 2016 Zinger

nineoaks2004 wrote:
A surge protector may have been useful here.

Unlikely, as all this destruction was probably not due to a surge but damage by fire to the incoming power source. The OP's trailer may well have not suffered any damage at all had it been protected by an EMS (Electrical Management System) such as those sold by Progressive Industries which would have detected any line errors as they may have occurred and instantly disconnected power from the trailer. A surge protector alone won't do this.