Would greatly depend on who you plan to listen too.
Randy's CB Shop (
http://www.randyscbcenter.com/home.html) should help you with a product selection and mirror bracket, or you may try any of the truck stops in Council Bluffs. (Sapp Bros or T/A).
If you're not going to listen to any P25 or digital transmissions, which unless you planned on listening to Omaha too, you should be able to get away just fine in most areas with say a Pro-2055 from Radio Shack. Comes with a mounting bracket and 12v cable. You can even purchase an external mobile speaker in the event your cab is noisy.
You can read up on this scanner by going here -->
http://www.radioshack.com/product/i...odsPerPage=60&retainProdsInSession=1&y=11&x=8
3 Settings of Dim on the screen, 2500 ch memory, the ability to follow Motorola trunked systems, EDACS trunked, or LTR trunked systems, plus the standard VHF, UHF, 800 and 900.