I wonder how objective they really are. I mean for all we know the Chevy was loaded with 7 tons of feathers. Of course it will go faster than a truck loaded with 7 tons of anything else...
Seriously though, I've never considered a Chevy van/box truck for heavy work. And I can't tell you why other than I like Fords and they've done a good job for me.The marketing must have gotten to me.
Or it might be that most of the Chevy box trucks we see around here are either beat to death or built with really ugly boxes.