Wheel chocks - Best for trailer?

I use large yellow plastic chocks. When on un even or sloping sites I also lock of the tires by using ratchet straps. Simply hook into each wheel slot on the top, two opposing slots and apply just enough pressure to have a tight strap. No way it can roll and also reduces some back n forth motion. I came up with this in a pinch when the trailer rolled an inch or two and the bumper stopped it. I couldn't move the truck and a strap was all I had. Since then I use them almost always and have no need to spend $ on rotochocks etc. Works perfectly