it's possible.
they used to do all kinds of crazy stuff back in the day. i've seen ad copy for Buick rail service cars ( normal street going automobiles that can drop axles to put steel wheels on rails ).
i doubt that's going to be widely known or documented though. and it certainly doesn't sound like a factory option.
Buick actually did make trucks, but that was WAY back, a hundred years ago.
and Buick engines actually did get put into ( Chevy ) trucks by GM, but those were 322ci Nailheads about ten years newer than your find.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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