I have them for our trailer, and I won't leave home without them!
Our dinette is in the slideout, and if you have three or more people eating at the table, the trailer (mostly the slideout) would bounce side to side when moving about in the trailer.
As someone mentioned earlier, you put them up just enough to be tight under the slideout without raising the slideout higher than it is without having them under there.
As for the tires going flat . . . this is a myth.
I guess that would be an issue if you didn't have leveling jacks on the ground since they would hold the trailer even if a tire went low or flat!
Anyone here not use those when camping?
Our trailer is rock solid when setup now . . .
I level the trailer first with my old screw-up jacks to actually hold the weight of the trailer, then I put the built-on stabilizer jacks down just for extra security before I even put the slideout out, then put the stabilizers under the outside edge of the slideout.