The preferred method of restraining a load on a trailer is by the use of load securing straps (ratchet straps). There are many different varieties of these straps with different load ratings, it is always advisable to use straps rated to at least twice the weight of the load being secured. Two securing straps at the front of a vehicle, and two at the rear is the best way to ensure a vehicle is secure.
The trailers winch should NOT be used as a means of securing a load.
PRG Trailers have many types of these securing straps in stock (see accessories page), and we will be happy to advise on the best sort of securing strap for your needs.
All trailers manufactured by PRG have specific tie down points, either as loops welded to the chassis or holes in the trailer bed. These should always be used for strapping down.