He urged people to photograph their property and record all identifying details, such as the identification numbers stamped on to plates and welded on to the frames of trailers.
Thieves could easily change a trailer's registration plate but police could still find the rightful owner via the manufacturer's identification tags — as long as the owner had made a note of the number.
It was also a good idea to secure trailers with padlocks or wheel locks and to chain up quad bikes.
''It's inconvenient to chain them up, but it's even more inconvenient to lose your quad bike and have to go through the insurance claim process,'' Stainton said.
He also urged boaties not to leave items such as fishing rods, lifejackets and navigation equipment on board their vessels.
''People get complacent just because their gear hasn't been taken before,'' he said.
Holiday and industrial areas were commonly targeted at this time of year but suburban streets weren't immune.
''It might be a nice residential area but that doesn't mean people with bad intentions won't go there. Make sure your belongings are secure and chained up, or keep them out of sight.''