Never use it, partly because I don't think it would really stop the slide vs popping off the trim board it's pressing against. But mostly because I think using it would cause more damage than not using it, as I'm sure either DW, DD, DS or, most likely, I would disregard the hanging warning sign and push out the slide with it in place!
2009 Roo 21RS
2010 GMC Sierra 1500 w/ tow pkg
Nights camped in 2014:29 | 2013:33 | 2012:32 | 2011:33 | 2010:30