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Marc,
This topic has been discussed many times. You might try doing a "search" to see what pops up.
I do not use that type of chock so I have no real world info to pass on to you.
However when you chock you should ALWAYS chock both sides of the trailer! If you chock only one side you stand the chance of the rig pivoting. Not something you want to happen. Chocking is the first thing we do when we set up the rig. And it is the last thing we remove when breaking down. I encourage you to chock anytime you remove the trailer from the tow vehicle.
Someone will come along to give some first hand info about the type of chocks you're inquiring about.
Good luck.
HamRad
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