dodge makes a trailer wiring kit thatr is very easy to install it even comes with instructions it fits into the space in the bumper. i installed the kit in about 3 hours taking my sweet time. only one wire is alittle tuff it has to go to the brake light and be splices in.

 

Picked one up from wally world for about $25 and it has both 7 round and 4 flat without the adapter

 

So im assuming youve got a nice big lake to take your waverunners in?