He’s literally on a  roll .  Rather than chasing the American dream of settling down, securing a steady 9-to-5 and buying a mini mansion, Seth, a 22-year-old Tennessean, is exploring America from the $3,000 tiny home he’s hitched to the rear of his vintage pickup truck.  “I’m building a tiny home on the back of my truck so I can live rent-free and travel around the country,” Seth explained to his more than 450,000 social media viewers in a viral vid. The drifter, hailing from Nashville, offered