Have some questions on trailer weight and pin weight. We have a 2007 GMC 2500HD short bed 4x4. Just weighed it today on a CAT scale. Was loaded ready to go with generators extra propane tanks and fuel...
With the wife and golden retrievers on board you're 1320 over the truck's GVWR. I would feel comfortable towing with a set up like that. As far as I'm concerned a '07 Duramax dual wheeled truck would not be a whole lot better even though you'd be within your truck's ratings. I think where you are most likely to feel overloaded is going down long steep mountain grades. As good as your'07 Duramax is a tow vehicle it doesn't even come close to being as capable as the newer diesel one tons.