I liked the idea about the bumper doubling as an air tank. And I think people were kind of rough on the guy that suggested it.
In my opinion, I would rather a car would total itself before harming my truck, so I'm an advocate of a strong bumper.
I guess it all comes down to what you want your truck to be for. If it's a show truck, I can understand not wanting a fabricated bumper. But if it's a driver or a work truck, I don't see why not. And if it's hotrodded, I guess there are no rules, and as always, it's an individual's decision.