I picked up a HEMTT truck on Ebay - you have probably seen them or you can search for them now. It's a resin casting, but my hope was to build a train of them - which used to be common going to or from the old Military Ocean terminal in NJ.
I'd say don't bother -they are about 20% too big and do not fit on MTL 89' flatcars. The casting is decent enough though I imagine these were based on some other model or toy.
Too bad - maybe MTL could do these as a load.
Lou