But tariffs have been used in the car industry for decades. If you got rid of them completely within 5 years the American car companies would be closing plants.
The whole reason Japanese auto manufacturers build plants in the US was to avoid tariffs. Shipping costs are actually incredibly minimal for a vehicle.
So in my opinion, we've seen where they can work. If you value American jobs anyways. It does get hard to math out when you have to weigh the money the average consumer would save over the 10 million auto jobs in the US.