I am obviously late to this conversation, but will add my input-
We have a 2006 31QBH. We pull a 2500lb runabout behind it. Reinforced rear bumper & hitch was fabricated and installed by myself.
I keep a close eye on the rear bumper / hitch, and also the front pinbox / frame area for cracking or anything unusual. After 10 years, I can report no problems from pulling the boat behind our 'Cat.
For anybody to make a blanket, generic statement that it can't or shouldn't be done is hogwash. With the standard caveats applied, towing a boat or extra trailer can be safely done with undue risk.