You need the plates for heavy Schwintek operated slides. I have an extensive discussion of problems with these slides, including the installation of the plates at https://www.forestriverforums.com/fo...de-175612.html
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Gordon Sick, Calgary (51° North)
2015 Berkshire 34QS
The Manual I wrote for our 34QS: https://www.forestriverforums.com/fo...ml#post2579202
Toad: 2019 Ford Ranger XLT 4x4; Formerly: 2005 Acura EL (aka Honda Civic)
I have the same model as you. Metal plates can be installed on the kitchen slide, but not the dinnette slide, because that one is a flush type slide. I had plates installed at the Goshen rally years ago by FR and they are the ones that told me this.