I wonder if his 'American-style caravan' was actually American and so had electric brakes
- which are not used in Europe, so we don't have easy access to brake controllers. Which might explain the "no proper braking mechanism".
Most Land Rovers have a 3500kg/7700lb braked tow rating but I don't think that would be enough for any 40-foot trailer.
There must be some more to this story that's not printed - 'dangerous driving' here is the offence when the driver was intentionally dangerous, for example when a driver has collisions trying to escape
from a police car. If this driver had mistakenly thought the combination was legal, he would have got 'driving without due care and attention'. Unless he told the police officer arresting him that the officer didn't know anything about motoring law, which usually gets any offence moved one grade higher......