I know that on the 2002-2005 Expys you can swap rear bumpers/trailer hitch to upgrade from Class 2 to Class 3. Can you do the same on the 2006-2010? How about putting a 2004 hitch on a 2006?

Have a guy who's interested in buying the hitch off my 04 parts truck to put in his 06....

 

OK, so here's what I found out: 2006-2010 rear bumpers are welded to the frame, so they cannot easily be swapped out. The guy bought the hitch from me, and he's going to try to have his bumper torched off, or partially torched, and then weld or bolt in all or part of the hitch from my parts truck.