I absolutely agree with the drive at a safe speed not necessarily up to the speed limit comments.
Even without the Caravan, on winding back roads with a 50 mph speed limit, sometimes I don't drive more than 40 mph as I'd rather arrive in one piece. Much to the annoyance of those behind me - at least they can't blame it on my towing!
As for the accident at the start of this thread, if there was a lorry involved, anything could have happened that caused the outfit to get out of control.
I am new to towing and since both a speed awareness course and the CC Towing Course, I am ever mindful of leaving plenty of space in front to slow down gracefully and the need to be aware of all times what might happen in front.
There but for the grace of god.....