Trailer insurance schemes cover all trailers attachable to your car, such as, horseboxes, a box, flatbed, transport or tipping trailers. The one type of trailer that is difficult to insure are advertisement hoardings. It is a requirement under trailer insurance guidelines that you have an approved security device for your trailer. Also required is a copy of the receipt you obtained when purchasing you trailer. Unlike car insurance, that will cover your trailer for third party risks only, but not cover your trailer if it is damaged in an accident, any accident where the trailer is detached from your towing vehicle and as well as loss (theft) where as trailer insurance covers you for all these scenarios.