Before my Suburban I had a mini van. The burb is definitely an upgrade all around. That poor van got beat to shit. Plus the towing capacity, which is a necessity for me, was way way to low. I think the SUVs are in a different class then the Mini vans.
You are making an unfair comparison. The 2016 Silverado 15004wd has almost the same specs as the 4wd Suburban does. Does that mean you are also saying that the Silverado is not a heavy duty truck? I just fail to see the relevance of your argument. Of course a 1 ton equipped vehicle will have bigger and better components, that's why it can handle larger payloads.