Here is another 'odd' one...
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I've seen a few shots of smooth side and reefer trailers FV Trailers, but nothing else like the trailer above.
Maybe Strick offered any of their trailer designs as Flexi-Van compatable? (Or any flat bottom Strick trailer would work if the FV was designed around Strick Trailer dimensions?
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Also, I have found evidence in train lists of 20' Strick-Tainers running on FV Flats