BAL - Innovative Products for the RV Industry
I've seen this discussed before, and according to their own website, they're advertised for *stabilizing*. So, Bryan, according to them, you're correct.
That video mentions nothing about preventing roll away, though common sense dictates that this would *help* to prevent that. The video also shows how applying that device minimizes movement of the trailer.
DH and I definitely use the X chocks, but we don't depend on them to keep the RV "in place"...we use additional chocking devices for that.
We also use the small adjustable pedestals under the bottom step at both doors to prevent the side to side rocking when entering or exiting.
Edit to add: during the trip we just arrived home from, our camp neighbor reminded us that when you apply the X chocks when setting up, wait a few hours and tighten them again as the tires cool down...might have to do it a couple of times.
This video addresses that issue as well.
With every trip we learn something new, sometimes more than one thing...see our thread about "furnace smoke".