CRiS stands for the Caravan Registration Identification Scheme. The CRiS number is a 17 digit Vehicle Identification Number (VIN). All caravans manufactured since 1992 by National Caravan Council (NCC) members are recorded on the CRiS database by their. This VIN and the caravan description are recorded on a Touring Caravan Registration Document, which is sent to the caravan's registered keeper. Even if you own a pre-1992 caravan, or imported your own caravan into the UK, you can still register it with CRiS yourself. For caravans manufactured before 1992 you should find the VIN or chassis number on a plate on the 'A' frame or by the door.
For caravans manufactured after 1992 in addition to the above, you should also find a 17 digit identification number etched on the windows. This is your CRiS number.