If you're just getting a hitch and bike rack you don't need a ballmount, trailer ball and pin and clip. You only need to install the hitch and insert the bike rack into the receiver of the hitch. Here are a few hitches for your truck on hitchweb: 2002 Dodge Dakota Step Bumper Trailer Hitches

The picture of the bike rack you posted earlier is available here: Rola Hitch Mounted Bike Rack

Hope this helps!