Station wagons in North America were hit with a stigma about carbon monoxide poisoning in the rear seats. The term ''Station Wagon Effect'' is still used in relation to industrial and residential ventilation systems as well as in boating and of course the automobile industry. When mini-vans surged in popularity starting in the 1980s they had better ventilation at the rear, and today any wagon would need to stringently protect against CO inhalation. Still, the stigma remains.
Described in several links I just found here: https://search.brave.com/search?q=Station+Wagon+Effect
but I'm remembering that concerns about it started coming up in the 1960s when vehicle safety regulations were becoming a thing. Sorry, I don't have a historical reference at hand.
Audi sells the A4 and A6 wagons (and the RS6), Mercedes has it's E class wagon last I looked.