It’s barely sold outside the US because other places (like the EU) also care about the safety of people outside the vehicle. That’s why European and Asian cars (except the models explicitly for the US market like the Tacoma) are designed for pedestrians to be deflected, while US cars are a moving brick wall which will squish them like a bug.

Also, I suspect you’d need commercial plates and a special license to drive it most other places, due to the weight.