ED-n-KEL,
I believe Mr Adventure was directly quoting from the trailmanor.com webpage. In fact I have found the exact language at the following link:
http://trailmanor.com/WebDocs/Campin...-vehicles.html
The factory is usually talking about an unloaded trailer which many people have detailed what does or does not go in to that. Also, the factory is assuming properly functioning trailer brakes. As you may have noticed, there are users of this forum that believe you should tow with a vehicle that has adequate stopping power even if the trailer brakes fail.