I asked Thor about that chassis designation a couple of years ago and that is the method they use to distinguish when a model has a different GVWR (and possibly wheelbase) depending on Floor Plan. Examples given were the Hurricane, Windsport and Miramar.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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