A GFCI is not an overcurrent device , it is designed to protect human life not equipment.
21 has an exterior GFCI receptacle that also provides GFCI protection for the kitchen counter receptacle
If my memory is correct your Escape
has 2 - 15 amp 120 V receptacle circuits
If you lost power to all the 120 VAC receptacles in your trailer ,I doubt your problem is a tripped GFCI