Personally, I really like the Cushman Trucksters and those variants for light duty application. The only Kei class car Id really want is the Suzuki Cappuccino.
Truckster with diesel/3 speed and 4x4 can outwork large 'heavy duty' trucks because they're small, light, nimble, and have incredible payload capacity while maintaining the ability to reach normal top speed, approximately 40-50mph depending on actual drivetrain and tire selection.
Why would you buy a van with zero handling, quite a lot of thirst and no performance to tap about vs a car based van with all of that ?
Their payload-to-size ratio is still appealing back here. But since many of these Chinese mini trucks have no airbags and no ABS brakes, seems like they're not gonna be available brand-new back here anymore...