It is thus far about the transmissions. It seems with programers and tuners, it's alwasys the transmission that goes 1st. With a tune, intake, exhausts, electric fan, my duramax was over 1,000 torque at the wheels and 489hp at the wheels.
Many diesels, ford, chevy, dodge, can take 50-75hp and a couple hundred more, but it will cost you a transmission rebuild.
It's a cat an mouse game right now.
Used to be a good toy hauler was 18,000 lbs. Now they can be as heavy as 21,000 from what I've seen. Then TC with 4 slides push 6,000 lbs also. I don't think the old wood ones in ol' days were near that. I personally like the horse power wars.
But, I think at 21,000 lbs capacity, 850tq, etc, I'd wish they would focus on the MPG part a lot more!