There are a lot of guys that post interesting eBay and Cragslist and auction finds here. http://www.oldgmctrucks.com/
A search of Craigslist nationwide is here.
http://www.adhuntr.com/

There is a guy in Weatherford named Dan Solt that has hauled several for me. [email protected]
I am also in the trucking business. Have been for 50 years. Although we transport mainly dry bulk commodities, I do have 2 flatbeds. Quite often I can get them moved by someone who has a partial load going south. And I have a 20' tilt carhauler with 2 7k axles and a class 5 hitch on my GMC 2500HD.