What's the difference between a Chevy Suburban C1500 and C2500?

If the 2500 is an 8-lug wheel; the brakes, axles, suspension, are heavier duty. The vehicle has a higher load rating.
If the 2500 is not the 8-lug wheel, then it is just a half-ton with heavier rated springs, but not heavier brakes or axles. It was designed for a vehicle that was going to be used to mainly carry loads.

The 1500 is just a half ton rated SUV.

Now that I think about it, I think that the light-duty 2500 was only available on 4wd models.
 
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