No matter what the circumstances were that pertain to this particular accident, the owners had a very bad day.....
Over the years, I've lost count of the number of occurrences I've witnessed involving tow vehicles/trailers taking unnecessary risk on the highway.
I firmly believe that drivers should require a special towing endorsement on their license before being permitted to tow anything greater than a couple thousand pounds. There should be mandatory training and a road test which covers topics like vehicle capacity/trailer weight, hitching process, basic trailer inspections, impact on vehicle handling, basic maneuvering techniques, emergency procedures, etc.
I know such qualification training won't eliminate all issues, but it would certainly be a step in the right direction.