Hello everyone. I have a 1998. 5 Dodge Cummins with the factory tow package. The plug that is found in the back of the truck, by the hitch, is a 6 way plug with 1 round plug in the middle. The trailor I am going to be towing has 6 round with 1 round in the middle. So they are both 7 way plugs just one round and one flat. Now i have called the local dodge dealer and they have never heard of such a thing. So i called a local trailor company and they were not sure what i should do? Anyone ever had this problem and if so where can i buy an adapter? thanks, nick.