There are two issues with hanging weight.
-1: 1200#s worth of tractor weights hanging on the front of a truck does not "appear" stock, to Jim Bob sitting the the stands contemplating hooking to the sled. And because it does not "appear" stock, Jim Bob decides hes not going to hook against a "pulling truck."
-2: The farther forward from the center line of the front axle, the more leverage weight has to keep the front end down, thus making it more effective. IE: 800#s hanging 60" in front of the axle from a weight bar, is better than twice as effective as 800#s tucked up under the core support inside of 30" forward of the axle.
The point is to have an entry level class that a person can mod a truck and make horsepower and not have to run 2.6" just because he ditched his VGT turbo for an S300. Its intent is to get new blood into the sport, more trucks! The class should always appear as if a truck rolled in off the street and hooked to a sled.
If you allow hanging weight on a weight rack, you further seperate purpose built trucks (which are inevitable) from once or twice a year TRUE street trucks. The concession has been made allowing "Ballast" as long as it does not extend beyond the drip line of the truck. This lets Dmaxs and 2nd Gen Dodges fatten up to hit 8000#s, where most CRs and Fords sit close to anyway.
Caleb