Motorhome speed limits UK

How do you know the unladen weight, where is it recorded.
The usually 'unladen' weight often quoted ncludes an allowance for a driver and three quarters (I think) of a tank of fuel, but that's not the actual unladen weight of the bare vehicle ex factory.
IIRC, the unladen speed limit is a throwback to something called a heavy car, a car which was over 3 tons unladen.

One of the things that bother me, as I travel a lot on the M11, is the number of people towing caravans and trailers going to and from the Ferries who completely disregard the 80kph speed limit ( unless the limit is lower ) for towing on all Irish roads,:devil:

The blanket 80km/h limit for towing, as it stands, is pretty stupid
An Artic towing its trailer is allowed 90km/h on motorways while a rigid truck with a trailer is limited to 80km/h.
at the other end of the scale, a little baggage/camping trailer is subject to the same 80km/h limit.

There are four categories for trailers in EU regulations
O1 Trailers with a maximum mass not exceeding 0.75 tonnes
O2 Trailers with a maximum mass exceeding 0.75 tonnes, but not exceeding 3.5 tonnes
O3 Trailers with a maximum mass exceeding 3.5 tonnes, but not exceeding 10 tonnes
O4 Trailers with a maximum mass exceeding 10 tonnes

Towing speed limits should be based on the trailer category being towed

In France, for example, a vehicle towing a category O1 trailer can travel at the posted speed limit for the towing vehicle, in other words having such a trailer does not subject you to a reduced speed limit. This is probably one of the reasons why so many have a 3,5t motorhome and a little 0.75t trailer, plus the rig can be driven on a B Licence.

Not Speed limits but related -
https://www.aboutcampbtob.eu/e…ep-closer/

In its first reading on the reform of the Driving Licence Directive, the European Parliament approved an extension of the B driving licence to 4.25 tonnes for motor caravans.

Following the Council in December 2023, the second EU institution has thus also given the green light for the driving licence amendment the caravanning industry has been calling for.

As part of the planned amendment to the driving licence directive, the European Parliament has approved an extension of the B driving licence to 4.25 tonnes for motor caravans, among others.

The exact framework conditions for the extension of driving licences will be negotiated in the trialogue between the Commission, Council and Parliament after the new elections to the European Parliament (6 to 9 June 2024).

An extension to 4.25 tonnes offers the opportunity to make sustainable and family-friendly travel by motor caravan accessible to millions of people in the future.

The increase in the maximum permissible weight to 4.25 tonnes for the B driving licence is to apply to motor caravans and ambulances, regardless of the type of engine. For other vehicle types, the increase in the gross vehicle weight is linked to the use of an alternative drive.

The European caravanning industry has been campaigning for years through its umbrella association, the European Caravan Federation (ECF), to extend the weight limit of the B driving licence to 4.25 tonnes for all motorhomes. Simple, consumer-friendly regulations are necessary to enable people to enjoy climate-friendly, family-friendly and safe holidays. An increase in the weight limit to 4.25 tonnes, which is open to all technologies, will also serve regional development and contribute to the fulfilment of European sustainability goals