They've actually been doing this test for a few years now and have run a dozen or more trucks up. Lately they've been doing the max load but they used to do it more conservative number around 7 to 8,000.
The first one I remember watching was a 3/4 ton diesel Chevy that the transmission overheated in, I think it was the transmission. Chevy sent engineers out and was able to use the data to see what the problem was and fixed it. They took the same truck up later with no issues. It wasn't a part fix or failure something like a sensor that wasn't allowing preventative cooling to happen in a specific situation.
This is the second test on the Chevy video, over two years ago: