Why were the wagons banned?

Ddaddy said
The version I alway wished they made for the US is the “Valiantero”. Not the square back cab like they did south of the equator on A bodies. Maybe after I retire I will chop up a 4 dr and build one. I think it would be cool as hell.

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I’ve got a 72 valiant 4 door that I seriously considered doing this with but I’ve got too many projects and decided to part the car instead.