Toyota leads in SUV sales in the U.S.–by a non-trivial amount
By Gary S. Vasilash
Although it might seem that when it comes to trucks and SUVs, “trucky” things, that Ford, General Motors and the company formerly known as FCA which was formerly known as Chrysler, would be dominant.
When it comes to pickups, yes. The numbers of F-150s, Silverados and Rams is truly extraordinary. Who knew that so many people were in need of boxes on the back of their vehicles? (Yes, people who actually do work with their trucks, do, but somehow that guy down the street who uses the bed to carry mulch once a year. . . .)
According to analysis firm Inovev, SUVs represented 53.5% of the U.S. market during the first quarter.

And of them, most carried the Toyota “T.”
Inovev notes that Toyota has outsold both Chevy and Ford by about 50,000 units, with Toyota sales being just shy of 250,000 units and the other two slightly below 200,000 for Q1.
Inovev points out that Toyota also leads the Big Three in the sedan category (Camry, Corolla).
So if there are three big categories–trucks, SUVs and cars–the Big Three is now only dominant in one.