I think if your unit came from the factory with slide lock bars, FR would have put square white stickers on the wall above the slide to indicate where they should be placed. Whether or not you choose to use them is up to you. I always will. They only take a couple minutes to install. Just make absolutely sure you remove them before trying to open the slide!!
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)