Receiver hitch size on newer Tow vehicles?

Then again, some trucks did not come with a factory hitch, as my 96 K3500, 2000 - C2500 and 2005 DW 3500. Kind of nice this way, as then you can choose a hitch that fits the needs you have, vs the engineers in Detroit etc, that do not know what you are going to do with the truck etc. I put higher rated hitches on ALL three trucks than came stock. The 96 and 2000 had 2" hitches, the 05 I went with a 2.5" hitch. The 2' were good to 10K with or with out wd bars. the 05 IIRC was around 15K with or with out bars.

Marty