Thor Industries' (NYSE: THO) fiscal 2018 third-quarter earnings, released on June 6, helped stem some of the company's recent share price decline: After surging nearly 51% in 2017, Thor's shares have lost one-third of their value year to date. As my colleague Dan Caplinger recently pointed out, the recreational vehicle, or RV, market remains strong, but investors are concerned about Thor's near-term prospects, given that it's coming off a period of phenomenal revenue growth.