Hey all have a couple questions. Both of my trailers have four pin connectors. My '02 F-150 has the four pin connection My '07 F-150 has both the four pin and seven pin connection But my '03 F-550 only has the seven pin connection How do I go about setting either the trailers up to be able to hook up to both four and seven pin connections? Or how do I go about setting the F-550 to accept four pin connectors? Hope that made sense.