I haven't read all of that thread but it seems to repeat the same for and against arguments I've heard for the past few years. There are a lot of people who A-frame small cars behind motorhomes and campers with no safety issues. I'm going to go ahead with my plans for an A-frame unless and until there is some definitive legislation against it.
Peggy's been camping!
If I told you I was a pathological liar, would you believe me?
perhaps it is worth telling the insurance company that you intend to use one so at least they don't try to wriggle out of a claim should the need arise.