Watch out when using them on plastic top folding tables. They can slide around easily and they can vent a lot of heat out of the bottom warping the plastic table top. I have two identical plastic topped tables with folding legs. One I still use with the trailers and when I camp with a tent. The other sits permanently in my backyard and is used as an outdoor work table. I warped and melted the tabletop grilling in the winter during hunting season with a cheap tabletop Grill that used lava rocks on the bottom rack. I bought a folding metal table to use with my tabletop Grill.
