Make sure tb has aftermarket trans cooler. If you screw up tb 4l60e it’s a $3500 repair. Brake controller installed. Tire upgrade from p rated to lt E rated. We were at gross combined weight with one baby at time. Truck carried 450lbs hitch weight, stroller, cooler, 100lb lab, car seat, and 3500 pound trailer. Climbed 15% grade 3 mile hill to housing development. Backed pup up to garage with a hot 5.3 v8. Trans slipping as it backed up sloped driveway.
You will have 650lb hitch, 100 pound wdh and be left with 550lbs to fill the seats and rear cargo before exceeding several ratings.
