I'm curious, would Australian "trucks" (we call them "utes") satisfy your needs if they were sold in the US?

Examples:

- Holden (GM) Colorado: https://www.holden.com.au/cars/colorado/ls-single-cab-chassi...

- Toyota Hilux: https://www.toyota.com.au/main/hilux or Landcruiser 70: https://www.toyota.com.au/main/landcruiser-70

- Ford Ranger: https://www.ford.com.au/commercial/ranger/compare-models/?in...

- Nissan Navara: http://www.nissan.com.au/cars-vehicles/np300-navara/range-an...

All of these have a single cab option and small beds (relative to American trucks).