Dh is getting a bike!

This, of course, means that I can no longer just use the back of my Highlander for carting bikes around, and I need to get a bike rack. We've decided on the Thule T2, but I need a hitch installed on my Highlander. Which brings me to my question . . .

I don't ever foresee actually hauling anything other than a bike rack, so do I really need all the wiring and such done? Or can I just have the hitch installed and be done with it?