The Lonestar attracted pick up and car builders to the big rig genre. It looked like an old IH pick up and it looked like a 1930s vehicle. Car builders seem to be stuck on pre-1970 vehicle design. Basically, if it doesn't fit in to their race car motif, as a backdrop or has a pseudo, hot rod facsimile, they really aren't interested in big trucks. And also, at least one model car builder stated on the forum that the amount of parts was too complicated. Yes, commercial vehicles are expensive and complicated compared to cars and pick ups And yes they are more expensive and time consuming to bring to market, but no more complicated than military subjects.