"All 'Heavy (big!) Trucks' made in other parts of the world" will face the higher tariffs, Trump said in a post on Truth Social, attributing the move to protecting U.S. manufacturers from "unfair outside competition." He also implied there are "national security concerns." There are always "national security concerns" when the federal government decides to impose a new iteration of tyranny on the American people. 

Domestic brands such as Peterbilt, Kenworth, Freightliner and Mack "will be protected," Trump added. As in from the competition.

Interestingly, it's a foreign company – Daimler, parent company of Mercedes – that owns Freightliner and Mack (and then there's Volvo Group) but never mind that.

There are two things to understand about tariffs. The first is that they are just another name for taxes. The money is extracted differently than say income taxes – but we're forced to pay for them just the same. Instead of paying say 25 percent of what you earn to the government, you pay 25 percent more for the tariffed item, to cover the cost the item's manufacturer pays to the government. Does it make ay difference? You are still 25 percent lighter in the wallet.