Suggestions on buying a truck?

[Longwell]

I plan on buying a TV this summer, in preparation for buying our Montana in 2011. This will give me time to make sure the truck is in good shape for our fulltiming (and to sell what I have to sell to be able to afford the truck).
However, I am having trouble locating any sizeable, large-volume, reputable truck dealers that have a regular supply of this type of truck anywhere near Western Pennsylvania (within 500 miles or so).
I want to buy a 2006 or 2007 Chevrolet or GMC (so I can install the Banks Electronic Speed Brake, which doesn't work on Fords, darn it), 1-ton with a crew cab, 8' bed, dual rear wheels, Cummins and Allison.
Do any of you know of a reputable, large-volume dealer in this area?
I am watching several sites already, to get an idea of availability and quality and so far have found the "North Texas Truck Stop" to be the best one so far, but it IS far (from here ).
Thanks for any leads on this.
Larry

[NCFischers]

If you buy a GM product, you will get a Duramax diesel, not a Cummins. It's still a good strong engine. Good luck with your hunt.

[richfaa]

Larry... Few dealers will stock the kind of truck we need set up for towing. We ordered both of our Ford F-350 the way we needed them. See if you have a friend that works for one of the big three?? They can get you the employees' discount and save big bucks. You may be able to buy new??

[TLightning]

In today's market, buying new might be the way to go. I ordered my last three trucks, got them EXACTLY how I wanted them. Takes about six weeks or so.

[kdeiss]

Larry,Their is a used truck dealer on Rt 14 in Columbiana Ohio that always have nice looking used HD Trucks on their lot.I can not remember the name. Columbia is about 18 miles west of the PA boarder.
Take Rt60 south to PA 51 take 51 west this will become Ohio 14