Slate Auto — the company focused on assembling US-built, mid-$20,000 electric pickups — said its upcoming product hit 160,000 reservations. Myung J. Chun / Los Angeles Times via Getty Images Slate Auto secured $650 million in new funding to produce its EV trucks by the end of this year. The investment round raises the stakes for Slate right as US EV sales hit a hefty speed bump. Over 160,000 customers have deposited a refundable $50 reservation for the truck. Investors are betting a fresh $...