I would be willing to say that a small Japanese kei truck is more than the average American would ever need for hauling furnishings, appliances and lumber. If you really need something bigger renting a trailer or truck is dirt cheap

>If you really need something bigger renting a trailer or truck is dirt cheap

It’s neither convenient nor cheap to rent a trailer in much of the US. Major cities have options, rural areas less so. Full disclosure I have a mid-sized pickup, but I recently looked into renting a trailer for a landscaping project that was above the weight limit for my truck. First issue I ran into was that there were not any trailers available for rent anywhere near my location. Second issue was that after factoring in driving distance + rental cost + dump fees, it was ~ the same price just to pay a junk company to haul the materials…and it was not cheap. Anecdotally, my pickup was cheaper than most other vehicle options at the time I bought it, my commute is short (so fuel economy is less an issue), and as a homeowner I use the bed to haul something at least once/month (Unfortunately kei trucks weren’t available at the time). So the cost/benefit/convenience factor of owning a truck over renting a trailer works for me. YMMV.

I found out a couple of years ago that you cannot rent a vehicle and use it to tow. This is a major barrier to the argument "when you need to tow <X> just rent a vehicle that can do that" (an argument I would like to support).

Except most people also use trucks as daily driver vehicles. You can't exactly fit the wife and kids in a kei. Sure you could also own a car for that but now I need to own/store 2 vehicles instead of one.