By Brian O’Connell Shares of a maker of recreational vehicles are trading at a very low multiple, but there are several reasons why. The lure of actually living on the open road is a big attraction to recreational vehicle owners. But you really have to want to pay $600 to fill your RV gas tank for that trip to Vegas. So, is there money to be made in the recreational vehicle sector as an investor? Real Money Columnist Jonathan Heller is adding up the pros and cons, with Winnebago (WGO) – Get Winnebago Industries, Inc. Report as a stock purchase in mind. “Recreational vehicle manufacturer Winneb…