HITTING THE STREETS Our masked writer, sitting at the right-side controls, lines up a refuse bin with the side-loader arm. WHEN MACK Truck’s press people invited me to drive their electric trash truck at its headquarters in Greensboro, N.C., I was just so there. The very phrase sounded magical. Electric Trash Truck could be the name of my ’60s art-rock band. They also offered to let me use the side-loader’s grabber arm to fling bins into the air. It’s harder than it looks. But mostly I accepted because of a particular trash truck I used to hate in my old neighborhood in Los Angeles. About 5 a.m. this thing would come up our street, bawling like…