Once a symbol of rural grit, the presence of the best-selling pickup truck in a song may now mean something else.Country singer-songwriter Jenna Paulette drives a white Ford F-150 pickup truck, a gift from her cattle-rancher grandfather when he retired from driving. “He called me and said, ‘Hey, sug, I got a 2010 F-150 with sixty thousand miles on it, and I was wondering if you’d drive it for me,’ ” the native Texan, who grew up in Lewisville, recalls. “I still drive that truck to this day; I’ll never get rid of it. It keeps me connected to him...