Hey Rusty, I had the same problem. There are only two types of connectors used and apparently Dodge stopped using the square and switched to the round style connector in 2010. This is the same style that Chevy and Furd use. You should be able to exchange your Dodge DrawTite cable for a Chevy/Furd.
I think the BARGMAN 90° harness is the most heavy duty and has a 90° bend at the plug so it fits up in the bed rail nicely. I got mine here
Trailer Parts Superstore - Fifth Wheel or Gooseneck Wiring Harness, #5197410
Hope this helps...
Rick