Yes, 30 mph would be safer Steve, of that there can be no argument if everyone did the 30 mph, but common sense prevails!
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
The point that I'm making is that 60 mph is probably safer (slower speed, more time to react if necessary - especially bearing in mind that the average reaction time is between 1 and 2 seconds in the real world (Johansen 1977), impact at lower speed if that should occur) than 80, especially with a caravan in tow.
Personally, I think that the law in France is pretty stupid, given tha in my case, I have a tow car (and previous winner of the TCA which I bought following the testing) which weighs in at around the 2,700 kg towing a caravan grossed at 1500 kg. Surely that would be much safer at higher speeds than a Focus sized car towing its maximum and yet under the 3500 kg limit. However, I am restricted to 90 kph, so be it. I would probably tow at between 60 mph and 65 mph if allowed, but I'm not, so quite happy c.56 mph. I still get there, and probably not much after someone who travels at the higher permitted speed, and certainly more relaxed.
There are always certain individuals who regard speed limits as targets and not limits, just as there are those who have a higher perceived ability in their driving skills than actual ability. I used to measure them up on a regular basis! Certainly for a first time tower, I would suggest erring on the side of caution, wouldn't you?