I was only asked to review and comment on the article AFTER all of the testing was done (as was Josh).

That said, one thing that probably didn't make it into the article which Josh had pointed out, is that although the Wheel Energy test rig does have a bit of damping inherent in the load application (due to the use of an air cylinder), the amount of damping supplied is basically an order of magnitude lower than what would represent the damping of a human body. This will have a pretty large effect on the absolute breakpoint pressure for a given roughness, load, and speed.

So, although they appear to have found a breakpoint pressure with the rig, that still doesn't really give any actionable information...

I expressed my opinion about the necessity of "rough surface" testing at the time as well...but, I'm pretty sure the VN folks are of the opinion that it's hard to convince people without having something like this, for many of the same reasons I pointed out a year ago (i.e. lack of understanding of the loss properties of tires by the consumer).