Looking at the list of exhibitors I can see the following that do VW Conversions and expect each to have multiple examples of their T6 conversions (plus a couple with Crafters as well) on show:-
Rolling Homes
Hillside Leisure
Volksleisure
CMC Reimo
Bilbos
Auto Camper
Danbury
There may be some others who's names I didn't instantly spot/recognise from the list. Even if you have no interest in using any of the above it is great to have a look at what some of the biggest players are doing.
It is a great show to have a look at not just the campers but all of the other bits you need to go with them.
Go and enjoy - worth the journey especially if you have never been to a camping show on this scale before. I'm not currently planning on going this year but have been for the previous 3 or 4 years (plus going to a similar show they hold in October a couple of times).