All kitchen outlets not working might be a junction box connection somewhere underneath the trailer, or a bad connection in the daisy chained Insulation Displacement Connector outlet chain. IDC outlets are used in the assembly line construction of RV's, and are like a 3M Scotchlok connector with springy v shaped blades piercing the cable insulation and making a (usually) poor electrical connection with the wire conductor, with a very small metal to metal contact area.
A non-contact voltage tester "sniffer" can be very helpful in determining where hot power is lost, although determining where neutral side is lost requires the use of a directly connected voltmeter.