Z, the seminar I attended was at an RV show in Hamilton Ontario. It was hosted by Andrew Thomson who is highly respected in the world of specialized towing and tow vehicles. Here is his site on seminars. Can-Am RV :: Events & Seminars
He does travel all over North America and is known to do seminars at Rallys in Canada and the US. If interested you could contact him to see if he would be speaking at a location near you.
There many be other knowledgeable folks giving seminars too but the only other one I know of would be Garth Cane who also is from the Toronto area.