When he turned 65 in 2013, Lee Klass never considered a retirement party. Instead, he continued doing pretty much what he’s done for years, setting out from Portland, Ore., in his Freightliner 18-wheeler and hauling loads of packaged food and consumer goods across the US. That way, Klass was able to keep the money flowing and ultimately collect a bigger Social Security check. “I still enjoy driving and the adventure of this job, and I’m not wealthy,” says Klass, who took home about $25,000 last year and has no retirement savings plan, but for the past three years has received