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Holy Dog ****?.... I think the heavy duty suspension sounds pretty close. I tried googling it and got some related info about the HDS having a little less travel, so I'm assuming that means heavy duty suspension.
My son had the ATP which was a lot like a Magnum but with a dump bed instead of the rear rack. It had two coil over springs to suspend a massive trailing arm solid rear axle. It was very heavy duty. Makes the most sense to me.