At hardware stores along the U.S. East Coast in recent weeks, TD Bank has been trying to persuade shoppers to think bigger than paint and plumbing supplies: The bank wants them to start taking cash out of their homes again. The TD Bank tour bus, equipped with a galley kitchen and iPads where homeowners can start the application process, is part of a marketing push unusual for the mortgage industry since the housing bust. As the broader mortgage market remains in the doldrums, banks are again touting home-equity lines of credit, which allow homeowners to draw down the equity in...