Hino IS Toyota, always has been, AFAIK... UD is Nissan Diesel America.
There are two 500 series Hino Xtra Cabs (body style shown above) sitting at a SE US salvage yard, though I have never seen a crew cab Hino in that body style in the US..
Would be a cool build, but IIRC, they are the size of an FM Fuso.
Someone mentioned in the FE/FG thread below this that we didnt have anything between those two sizes, but UD makes 18k, 20k and 21-22k models before going to the big trucks.
Isuzu had an FRR until 2004 at least and Mitsu has imported various medium size models (bigger than FE/FG but smaller than FH/FM)