Got a link to 2023 +/-1 Toyota truck for sale in the US that has only one row of seats? I couldn't find it on their website, but maybe it's hidden away somewhere?
Chevy's small truck doesn't come with a regular cab either. I expect you can probably get a chevy commercial truck with a single cab, but those are big trucks.
EDIT: I looked on a bigger screen, and Chevy does sell the Silverado with a regular cab; but that's a full size pickup. You used to be able to get an actual small truck in America. And you can still get one in Australia.