I own the 6.2 with the 10 speed (at4), my father owns the diesel. I have towed with both, I prefer the 6.2. They both have pretty much the exact same torque, 6.2 has way more hp. You’re going to sacrifice fuel mileage, however gasoline is cheaper than diesel and if you don’t drive all that much it wouldn’t make a difference. The only time I wish I had the 3.0 is when I take trips from Connecticut up to Maine when I wish I got a little better mileage (still get 16-18 going 70 on the highway) not towing of course. My vote, 6.2.