Was the electrical fixture a "speed box" on the order of this?
They're commonly used in mobile homes. Unfortunately (at least in my opinion) that makes them the choice for RV's, what with their construction being similar. Unfortunately again, those Double Wides probably make but ONE road trip, and our RV's make hundreds. Usually, the connection simply fails. Whatever is plugged in or wired through, no longer works. We've had it here recently with dead outlets. Also common, the electric side of the water heater quits and it turns out to be a Speed Box.
Speed Boxes are the same concept as Scotch Locks:
Position the wire over the "teeth" of the connector (Speed Box or Scotch Lock) then Press, Squeeze, Push or Screw. The connector pierces the insulation and makes up against the conductors of the wire to complete the installation/connection.
What could possibly go wrong...?