the way i did it on my 2007 tahoe was i took the mounting plates and cut them down so i could mount them to my roof rack, then i just run the liberty power and LC cable into the back hatch here i have a round milti pin connector like this
Waytek carries Delphi's Harsh Environment Series (HES) Connector series, fully interchangeable with Duetsch HDP connectors and a ATV winch plug for the power and ground cable, takes me about 5 min to put on the truck. and its all in a little cubby in the back drivers side of the cargo area so it looks nice when not in use, and i dont even really notice the brackets on the roof rack since i panted them black.
here's another thread that shows what i mean with the mounting plates, scroll down to TritonBoulder47's post (this is where i got the idea for mine).
http://elightbars.org/forums/f13/mounting-whelen-bar-07-10-tahoe-burb-rack-4174/
i would post pics but i dont have any on my laptop, and i wont be back in the states untill dec 4th but i could get you pics then.
good luck man!