I have found this camper site on CamperContact:
Maastricht Marina
http://www.campercontact.com/en/nederland/limburg/maastricht/29476/maastricht-marina.aspx?lang=en_EN
Maastricht Marina
http://www.campercontact.com/en/nederland/limburg/maastricht/29476/maastricht-marina.aspx?lang=en_EN