I'm sorry, but even a casual observer can plainly see that the image above is severly doctored.
Slideout stabilizers were popular when RV manufacturers first started making slideouts available. Technology has made their use unnecessary. Some posters may have TT's that are old enough to not have this technology that newer RV's use in the construction of slideout systems. If your slideout is sagging and in need of support, it most likely needs to be repaired. If manufacturers intended for their customers to use these devices, and actually required their use, they would have to be included when the unit was purchased. A lot of companies who sell RV equipment would be happy to relieve you of your money, but in case the image above causes concern, the best bet would be to contact the manufacturer directly - by phone, so you don't get any internet hoopla :P