Slate Auto stands on the verge of its biggest test yet. The four-year-old electric vehicle maker, backed by Jeff Bezos and Los Angeles Dodgers owner Mark Walter, will reveal final pricing and begin non-refundable preorders on June 24. First customer deliveries follow late in 2026. Emails sent to reservation holders this week urged a $50 placeholder now. Those who act fast secure priority. The actual preorder requires $300. Miss the initial 30-day window and your spot slips down the queue. Simple as that. More than 160,000 people have already placed refundable $50 reservations. The appeal is obvious. Slate promises a stripped-down, modular truck that buyers can convert from two-seat pickup to five-seat SUV. Hand-crank windows. No factory paint. Minimal electronics. The base model once targeted under $20,000 before the federal tax credit vanished. Now the company talks mid-$20,000s. That figure must hold if Slate hopes to stand out.…