try searching on here, you can use thule or yakima. you will have to atleast permanently mount a track on your roof though. look at the options (on either, it can be hard to find) for mounting on a cab.
YAKIMA:
tracks
Landing Pads
Control Towers
Crossbars
I recommend the 56' or longer, locks and a fairing to GREATLY reduce noise as well.
Here is a link to a write up Collinsz did when he installed his Thule rack
other threads with pics:
Yakima rack
...slow at work...
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2006 4x4 CC SE, Stock Suspension, Leer Browning Special ed. Shell with Thule Rack and locking gun box. BFG ATs with Nitrogen.
4 Infinity Kappa 60.7cs components, custom tweeter mount in rear doors, 4-channel Infinity Ref475A, Pioneer Avic-D3 bypassed with bluetooth and i-pod interface.
Future: Sub and Amp, Mounted Inverter, Thule Rack on the Cab of the Truck, and plenty more i dont need to think about right now
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