Scotty, while I have a GMC 1500, I will agree that I have settled on 6.5 for the brake controller setting, I would guess that the output should be pretty stable across the field, the differences would be in the weight of the trailer, so full water and load maybe a notch higher.
As far as the connection issue, I think during all my research I remember something about the Ford connectors, I think it was somewhere in the airstream forums, if I come across it I'll forward it.