It's a great trailer but I wouldn't want to go much heavier. Maybe 500 lbs heavier at most with my generous 1582 lbs payload.
Truck pulls it great with no strain but I do use a top of the line sway control hitch, the Reese Strait-Line system. You definitely can feel the trailer back there especially in the wind but getting LT tires would make that much less noticeable.
Do remember my dry tongue weight is about 1/3 of what that toy hauler is, and loaded with an average 13% tongue weight is only about 845 lbs.