Good data Sean,... as we know someimes the 'tech guys' at RV places or truck repair places don't get to read all of these Bulletins.
It looks like they are not dissallowing the practice of welding to the frame though, just offering guidelines of how to do it.?
(and its interesting how the guys signed off on the first page too,.. a little techie humor perhaps ???)
I had my hitch welded on my '01 truck. Worked out great. I had more confidence with that then drilling and bolting. I'll probably reassess that next time around. Almost everyone else seems to bolt.