Product review (5 stars): Have them all over the trailer
I like these bars, and the refrigerator size bars, so much I have them all over the trailer.  In addition to using them across the width of the cabinets to keep things from falling out when I open the doors, I also have use them across the depth of the cabinets to keep things from sliding around within the cabinets.  (Yes, some of my cabinets aren't quite full - yet).  :)
They are easy to adjust to the right size and easy to insert and remove.  I use them in conjunction with plastic shoe/storage totes so everything is organized and I don't have stuff rolling around all over the cabinets.  This is a highly recommended product.