Year-over-year Canadian motorhome registrations tumbled 39.3% in September and 28.4% for the first nine months, according to the latest report from Statistical Surveys Inc. Forest River Inc. was the Canadian motorhome sales leader year-to-date, capturing a 25.7% market share, with Thor Industries Inc. holding a 25.1% share and Winnebago Industries Inc. 20%. Class A registrations declined 28% in September and 18% year-to-date.