I'm looking at buying a used class 6 truck. I've been looking at F-650, Freightliner 60, International 4200, Sterling Acterra, etc.; I'd like to hear any feedback you may have about trucks in this class. Is the F-650 everybit as tough a workhorse as the others in this class? I've looked all over for towing weight capacities (gcvwr / max-tow-lbs.) for these trucks and have had absolutely no luck finding it on the net. Based on what information I've pieced together I'm estimating that these trucks should be able to pull somewhere between 35,000 to 45,000 pounds. Sound about right? If you've got hard numbers and specifications then post them please. Any feedback you can share would be appreciated.