A white box trailer was stolen from a property in a small village near Harborough last week.
The trailer - similar to the one in the picture - was taken from The Lealand, East Farndon, sometime between 11pm on Tuesday, 19 January and 7.30am on Wednesday, 20 January.
The trailer is a twin axle Ifor Williams BV105G with a registration number of LR64 RCO and a set of 12 red LED lights on the rear.
A white van was in the area at about 3.30am on January 20 and the owner of this van may have witnessed something. Officers are urging the driver of this car to come forward.
Anyone with any information can call Northamptonshire Police on 101. Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111.