The U.S. is a big country, whether large vehicles are the most popular depends on what state you live in.
That being said, anyone from Europe will notice that there are way more of these trucks (designed in a lethal manner as you described) than they have ever seen before, no matter what part of the U.S. they visit.
Yeah, the problem I'm seeing now is that everyone on the right is seeing the left's reaction. And now they don't care if the shooter actually was someone from the left or not.
The response they see is all they need to justify any reaction. Of course they're conveniently forgetting their own response (and Charlie Kirk's response) to Pelosi's attacker.