I find the reasons that some things were built they way they were, interesting when it turns out that there were design decisions made based only on getting around tax laws (three wheelers) or import laws (the famous "Chicken Tax")

 

I just learned why it had those rear seats in the bed!

It was a way to get around the 25% “chicken tax” on trucks; with four passenger seats, it was no longer a truck, but an open air tourer, or something like that; a passenger car, in any case.

https://www.curbsideclassic.com/curbside-classics-asian/curbside-classic-1981-subaru-brat-with-third-eye-passing-lamp-a-brief-passing-fad/

If you haven't heard of the Chicken Tax before, I posted about it in 2011 https://justacarguy.blogspot.com/2011/09/chicken-war-and-chicken-tax-and-what.html