Car + caravan under 3.5t Motorway. 81mph, 130km/h Other roads. 56-68mph, 90-110km/h Car + caravan over 3.5t Motorway 56mph, 90km/h Other roads 50-56mph, 80-90km/h
I am led to believe you need to take into account the sum of ptac (poids total à charge) and not unladen weight. So a Land Rover with an empty trailer (even a small one) is over 3.5t according to the rules, even if empty.