Whanganui police have warned owners to keep their trailers secure following a series of thefts.
Whanganui area prevention manager Senior Sergeant Shaun Jones said trailers were more vulnerable to theft because they were less likely to have the same protections as motor vehicles.
Trailers were often left poorly secured on residential front lawns or on driveways and could be stolen quickly and quietly, he said.
"They are easy to turn over and on-sell, and it can be very difficult for police to identify the original trailer if it is located," Jones said.
Police are urging trailer owners to take protective steps: