I can't and won't get into the legalities etc., just stating my personal experience.
I have a 2003 DS (4050) 40 diesel coach. I have approximately 105,000 on it and have pulled my 2009 Chevy Silverado about 30,000 miles behind it. I don't know the weight of the truck either empty or loaded as we tow it. Sometimes it has a bunch of extra stuff in it, others it has our golf cart in it. I use a 10K rated Blue Ox tow bar and baseplate along with an auxiliary braking system. I have never beefed up the original hitch and inspect it once a year just to make sure nothing has broken or come loose.
I have never experienced any engine, transmission or other drive train issues that could be remotely attributed to towing my truck.
Advice to the OP, do what you want with this info on my personal experience.
