In fact there was also a Hino version. Mitsuwa had plans for a Isuzu and a Nissan Diesel as well. They never made it to a model. I do not no if the moulds are made.... The dump truck was, as mentioned, available as a "art-dump-truck" I own one of these and it is a rare thing. I bought it in Japan for over ten years ago. The cab is completely chroom and there are several badges of transparent colored 'lights'
I have build the Oriental Express build and this one in stock (sorry guys not for sale) The base of this kit is the same as the K100 kits from Revell. You just need to cut the chassis and build in an extra axle. It is a nice kit though.
I put the front wheels that Revell used for their 'Can do' wrecker and 'Bill signs' Peterbilt on it.