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While they certainly had some popularity, as you said enough to feature in bttf, and people remember obsessions with trucks like Bigfoot, generally it was still a more narrow niche.

Sedans, station wagons, sports cars were all pretty popular. Even the first big family vehicles were minivans that tended to have lower noses. The trucks of the time were downright sane compared to the modern mandate of trucks cosplaying as semis.

The 90s saw the rise of the suv.

But yeah, the critical factor for that timeframe in the chart would seem to be touch screen phones.