We've been importing them to Louisiana for 20+ years now. Although for the longest time they were only legal to drive like a farm truck (up to 40 miles from the farm) and only on 55mph or less roads. They also had limiters installed so they couldn't go over 55mph, not that its hard to remove the tiny flap of metal they installed to keep the throttle from opening fully.
There is one farmer we used to call the used kei truck salesman because at any given time he has 10-20 of these in his yard for sale fresh off the import boat.