[OneOfTheSick]

I didn't look at the link but it might have something to do with the fact that when a vehicle is loaded most of the added weight rests on the rear axle. So if someone loads up the bed until they are at the rear GAWR they will still be under the front GAWR and can't add any more weight unless they can put it in a place where it will only add to the weight on the front axle.