Information wanted

Suffolk member Carl would like information on his water bowser. 
The bowser was previously being used at a Suffolk cricket club.
He thinks the bowser was used by the Dutch and built in 1980.
Other details found on the bowser. 
contract details 
leverancier           jaro
contract no 080-80-29.11 date 23-8-78
merk                  jaro
type                    ww950L

Any information you have on its use, what vehicle pulled it, how it came to be in the UK, etc.
Please email Carl  his address is