I've got a 16 Expedition EL 4x4 WITHOUT a towing package. I'm getting ready to add a 5k travel trailer to my collection of toys. I've got everything sorted out as far as the brake controller and 7 pin trailer connection go (I think), but I know nothing about WDHs...Can anyone school me? I THINK I I'm on the cusp of needing one, but would love some feedback.
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