OP - I was starting to approach my GRAWR (about 200 under)and was over my ruck's GVWR. I went out and upgraded to wider tires going from 3042 to 3450lbs per LT tire. These wider tires required me to get wider wheels - which were also higher rated than the OEMs.....This is a lot cheaper than buying a new truck....it may not be ideal, but I feel a lot better - and yes, with those wider tires I can feel the difference. I also try to load heavy items to the back of the trailer - if possible.
One side effect - my truck's speed odometer now is exactly in sync with my GPS....it was always off my 3MPH.....
Good Luck.