Boosted by Class C sales, year-over-year Canadian motorhome registrations soared 36.8% in March and were up 10.1% in the first quarter, according to the latest report from Statistical Surveys Inc. Forest River Inc. was the Canadian motorhome sales leader year-to-date, capturing a 26.4% market share, ahead of Winnebago Industries Inc. and Thor Industries Inc. . Class A registrations fell 5.3% in March and 11.9% for the three months.