I'm skeptical that the import duty had a significant effect on truck and SUV sales in the US. A lot of this is probably cultural, coupled with the fact that much of the United States wasn't really settled and developed (at scale) until after WWII. Pickups are just more useful in places that are less dense. Plus, they look cool and are fun to drive.

>Robert Z. Lawrence, professor of international trade and investment at Harvard University, contends the tax crippled the U.S. automobile industry by insulating it from real competition in light trucks for 40 years.

This comment also made me laugh. I doubt that we'd be seeing everyone drive Tatas around the ranch instead of Fords if they didn't have a 25% import duty.