As I sat in the cab of the pickup truck and manually rolled down the windows, I closed my eyes and flashed back to opening the windows on a cold, winter day in my dads 1975 Ford Ranger to let more cigarette smoke escape. The memory faded as I opened my eyes and looked through the windshield at a wall in the Slate Customer Experience Center studded with bright color chips. Last week, in a former Tesla store staffed by some former Tesla employees, Slate opened its first showroom. Located in the...