I just read the referenced notes and went to their website.  All they are
saying is that it is the wrong tire for that application, title should read
"Dangerous if used on out monster motor homes".
BTW, interesting site.  Seems there are some people out there that are
obsessed with a vehicle older, bigger, and more complex than out Vanagons
and Vanagon Westfalia's, the GMC Motorhomes only made from '73 to '78.