'My guess' is the same wiring harness is used for multiple trailers and without all the options, etc. those unused are clipped off. You will find the same thing with vehicles when not all options are installed, wires capped off/unfilled fuse holder slots, etc.
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2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.
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