KenB helpfully posted a photo from his particular handbook in the topic "mk1 190 towing weight" which is a page showing GTW based on GVW for mk1. I can see no reason why the Mk2 should be any different. The actual weight may be different so will affect how much you can carry but I would say that the total weights should be the same as the chassis is essentially the same.
So try this link to get to it:
viewtopic.php?f=3&t=89802&p=765721&hilit=GTW#p765721This page is not in "Normal" handbooks only the one that Ken had at the time
Also class 4 is up to and including 3000kg GVW. Class 7 is 3001kg and above. My Mk1 has a GVW of 3000kg (not 2950kg) and is class 4.
Cheers
Doug