Wow. Not heard of a towball snapping. Hardings would have better knowledge than me ... but i find it extraordinary that the same ball that holds a 3.5t van would snap with a 1.5t van and a couple of bikes on a bike rack.
Some of the WDH mounted under the towball would be add as much force as a bike rack. Your probably sensing im not convinced. Ha
Yeah, might be a bit of a urban myth? Pretty sure it was Harding's that told me that the canter leaving (bounce) with the force of the van. I'm like you though and find it hard to believe. From what you said, it sounds like it works with no problem.
Oh...I didn't understand your PS question about the name link?