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Chevy used the HD name, 1500HD was a 2500 frame, 2500HD was the 3500 and the rare 3500HD was a Topkick frame. Was confusing because they made a heavy duty 2500HD, seemed kind of redundant. Ended when Ford made the 'SuperDuty' line and brought the 2500 in to the HD range, and Chevy started selling their 2500/3500/4500 range. Until early 2000s the 3500 was a stand alone unit and the 1500/2500 was shared architecture. But that's also part of what killed the 2500 Suburban, platforms diverged and 2500 Suburbans weren't cost effective outside of a few govt specials.
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