I think there are variances which are due to the time the vehicles are registered?
I just had a look at 4 V5Cs I have for 4 different vehicles and they all show different types of info regarding weight...
1) The oldest is a VW T4 from Year 2000, which started life as a commercial panel van, but ended up as a MOTOR CARAVAN, with taxation class of PLG (as it was a panel van originally)
The VIN plate has weight info, but the V5C has NO weight info whatsoever; and also does no show a M1/N1 type definition (think that came in in 2001?).
Annoyingly, I don't have a copy of the old V5C before I sent it away for reclassification as a Camper to compare.
2) I have a V5C from my old RAV4 from 2004. This is an ESTATE, and taxation class is PETROL CAR. This has an M1 Vehicle Category.
This has no MPM (Max permissible weight), but DOES have a Mass in Service. It had no towing masses indicated (but towbars are made and used with these vehicles)
Something else that appears on this V5C is emissions info
3) Got a V5C from my VW Shuttle from 2008. This is classed as an MPV, Taxation Class DIESEL CAR. This has an M1 Category
Wth this vehicle, I see a MPM quoted as well as a Mass In Service. I also see towing mass data appearing on the V5C. This V5C also has a Revenue Weight recorded.
Something else that appeared is Sound Level Data as well as Emissions Info.
4) Finally a V5C from my DS5 from 2013. This is classed as a 5 Door Hatchback, Taxation Class DIESEL CAR. This has an M1 Category
This V5C contains all the same info as the 2008 Shuttle, including MPM, Mass in Service, towing mass data, emissions and sound levels, but has no Revenue Weight.
So it very much seems to me that what info is included in a V5C is heavily dependant on the age of the vehicle and when it was registered. As time as gone on, more and more information has been recorded on new registrations, and the registration document enlarged to allow for that info, but when the standard V5C is reissued on older vehicles for whatever reason (change of owner/address/reg number/etc), those extra fields are blank not because they are not relevant, but because the information was not originally recorded as the time of first registration.
How that compares to other European Countries I don't know, but I would imagine there are plenty of little nuances in each Country that are not followed by other ones, but it is of course the UK ones that are important.
So .... for a 1992/1993 MPV, it is likely there are LOADS of fields that are not populated on the V5C, purely because in 1992/1993 they just were not required by the DVLA, and the V5C is a catch all form for EVERY Registered Vehicle in the UK from oldest to newest.