Yes, the Campines region has a lot of activity from North Brabant traveller families. I'd say that in places like Pelt, Lommel, Mol, Balen, Turnhout, Merksplas, etc...the drug trade is almost completely controlled by Dutch criminals from Eindhoven, Oss, Tilburg...

Local dealers can be anyone of course - mostly Belgian, Dutch, Turkish or Moroccan guys - but the ones in the upper tier of the drug trade in the Campines are the families from North Brabant.

In the municipalities along the Maas (Maaseik, Dilsen, Maasmechelen...) there's also activity from families from Vinkenslag. Bikers from Heerlen also have quite a bit of activity there as well.
Though I'd say that the ones most in charge of the drug trade of that region of Belgian Limburg are local outfits which are a mix up of Belgium-born Italians and Turks and local Belgians.