First, you are just misunderstanding how taxes work. Taxes are on profits and not revenues (Ford's profit margin in North America was 8.7% of that $30,000)... It is difficult to calculate the effects of taxation on the cost of goods because increases flow through the supply chain, but it is much more likely the Dodge will cost $30,600 rather than $32,400.
Next, tax increases are not borne by consumers alone. When companies are taxed at higher rates unavoidable taxes are distributed between owners, consumers, and workers. In reality, workers get a lot of the pain rather than companies.
Finally, U.S. companies don't pay that much in Federal taxes. Corporate taxes make up about 7%-9% of Federal revenues, just for perspective the Social Security and Medicare taxes make up about 35%-36% of Federal revenues. The corporate tax is about 2% lower than it used to be, but it is still not the thing that is likely to have a significant effect on your buying power. Corporations in the U.S. would not struggle at all with significantly increased taxes, you could easily go up to 60% and the effect would be minimal on U.S. corporations and consumers. It just doesn't work that way.
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However, you should support lower corporate taxes because higher U.S. tax rates puts oligopoly pressure on the market and makes domestic companies less competitive than multinational corporations. If you have intellectual property (which practically every MNC does) you can move profits from the U.S. to oversees segments reducing your effective tax rate and creating a profit advantage over your competition just from tax avoidance. This can be a fairly significant amount, at one time Dr. Pepper Snapple ran an effective tax rate 10% higher than competitors with an international presence.