You said 5-pin on the trailer? Does it have back up or interior light?On the ford 4-pin you might want to verify fit.
Picture of our 4 pin 01 f250.
I have nothing that will plug into it-its backwards as far as male/female housing & pins & I have a few different 4 pin flats. One on right is the ford, I tapped the back side and added 'standard 4 pin, on the left to it.
Added a round 4 pin with short pigtail that plugs into the std 4 pin.
I might suggest swapping the trailer plug to 7 pin plug and use bumper (also give room to add). Add 7 pin receptacle in bed for the camper changing it also to 7 pin. With what you have you'd only need 1 matched pair. Id be tempted to rerun a cord from camper if accessible-looks like a lot of tape?