Toyota's Biggest single money spinner outside NA

Why not in the US? For the same reason that all manufacturers stopped selling compact PUs in the US. As cool as they are, they don't sell well here. Look at the bed size. Do you really want that small bed? Few in the US do. Most buyers here want/need a full size truck.

The smallest the American market will tolerate is the mid-size PUs, Tacoma/Colorado/Frontier. And even those aren't breaking any truck sales records. Ram and Ford got out of that market, and even GM did for a while.