Some defintions of ULW include fuel, some don't. You need to check the definition used at the point you are starting from.
Given the party who may have an interest in what your ULW may be is a government agency, it is probably appropriate to look at their definition
Explanations of the different terms you might see on your driving licence
www.gov.uk
Unladen weight
The unladen weight of any vehicle is the weight of the vehicle when it’s not carrying any passengers, goods or other items.
It includes the body and all parts normally used with the vehicle or trailer when it’s used on a road.
It doesn’t include the weight of:
- fuel
- batteries in an electric vehicle - unless it’s a mobility scooter or powered wheelchair
As the statement above has the phrase "
body and all parts normally used with the vehicle or trailer when it’s used on a road" ,if we are talking about a Motor Caravans ULW, I would say the ULW needs to include everything that defines the vehicle as a Motor Caravan.
But lots of things we take in a Motor Caravan are not required for that definition. So you can ignore the weight of any
Solar Panels of course; 100% of all camping equipment can be ignored; you don't need any gas bottles if going from campsite to campsite; You don't need a Leisure
battery logically (you can use the starter
battery for any electrical power between sites); don't need an awning but DO need a table (table forms part of the definition of a Motor Caravan); Don't need TV, any clothes, water, etc.
If working with a "ready made" Motor Caravan, the information should be in the Brochures or failing that available from the Manufacturer.
Different Motorhome Manufacturers may use their own definitions of ULW - or call them MIRO (MIRO more common for Caravans?). Autotrail for example state
"Unladen mass includes the weight of the driver (75kg) and 90% full of fuel." . On that basis, Autotrails Unladen Mass for my particular Motorhome is 3085Kg, which is above the 3050kg max figure for the DVLA, but knock off 75Kg for the driver, AND at least 75Kg for Fuel, and the equivalent gov.uk ULW is 2935Kg, so well below the 3050Kg number.
I uprated my Motorhome to 3850kg GVW but that makes no difference to the ULW which remains the same.
If building your own Camper, then it can be a good idea to get an official weighbridge ticket so you have evidence you are not more than a certain weight.
Agreed, that would be more hassle than the conviction is worth so they wouldn't pursue however can we be sure that the burden of proof lies with the prosecution and not the defence? If burden of proof lies with the van owner then it's now up to the owner to prove that the UW is less than 3050kg, obviously the ridiculous level of difficulty now lies with the owner.
I've no idea which way round this argument works but this one point of 'burden of proof' seems to me to be the most important of all.
Taking the comment above, IF it is needed to provide evidence and you don't have the numbers from a Manufacturer, then having a official weighbridge ticket will be far more powerful than someones opinion based on observation.
The burden *should* be on someone trying to prove a wrongdoing, but can be useful to be able to nip things like this in the bud to avoid the situation getting to far.
For my last self-build, I took the van to the local weighbridge the day after I had the V5C back with the "Motor Caravan" reclassification, got a ticket and kept it safe with the logbook as a precaution (given the GVW was 4600kg, I thought it quite possible some interested authority might be of the opinion it muse be over 3050kg ULW. It was actually something like 2880kg from memory and the ticket shows this clearly to anyone who cares).