Definition of "unladen" weight ?

peasant

I've trawled revenue and governement websites for ages but couldn't find an answer ...so I'll put the question to the sages on this board:

What exactly is unladen weight?

This is in relation to the import of a motorhome, where VRT is significantly less, once it is above 3 ton unladen.

In other countries an unladen motorhome is weighed/calculated with driver (regulation driver = 75 kg) 3/4 fuel 3/4 water (if the motorhome has a water tank) and 1/2 waste water (if a waste water tank is present)

But these rules usually apply for cases where people want to have their motorhome classed below a certain weight for tax purposes.:D

So what about Ireland? Is "unladen" completely empty, with minimum fuel, no driver and no water in the tanks? Or some...or all of the above?

Anyone any idea?

Thanks !!

Rabies

Unladen Weight (UW)
The weight of the trailer (or towing vehicle) less removable optional equipment and load

taken from here. Don't know if its any help