Kent Police received a report that fencing around a yard in Ratling Road was damaged during the incident which saw a trailer stolen between 7pm on Thursday 1 April 2021 and 6am the following morning.
The stolen horsebox is described as an Ifor Williams HB511 model.
Anyone with information regarding the theft, or who saw anything suspicious in the area during that night, should call Kent Police on 01843 222289 quoting 46/54011/21.
You can also contact the independent charity Crimestoppers anonymously by calling 0800 555111 or using the anonymous form at www.crimestoppers-uk.org.