This is very good advice!!! Similar to what others old me when I asked this question.
"Your truck is marginal for the trailer you're looking at. If you change your tires to heavier rated ones and possibly add some air bags or heavier springs you could successfully tow that trailer. Would you be over the GVWR? Yes. Does that bother you? Only you know.
My personal rig is a truck camper on a '05 Chevy dually. Like many TC owners I'm well over my GVWR of 11,400 pounds. I've logged many thousands of trouble free miles at about 13,100 pounds on this truck. I'm not over my tire, axle, or even tagged weight so all is perfectly legal."