I can put my tools in the back of my truck cabin. And have the entire bed ready for materials.
I’d also never want to go over 40 mph or get on a suburban freeway in a Kei truck. You will die instantly in an accident otherwise. Their are zero safety features. And they’re not comfortable for any trip with any distance.
Kei truck is for people who work for the metropolitan city and never leave, or a university, or a golf course. Not a private contractor.