As you know the quick drives were all 2wd, they had a similar chassis as the intruder/hot machine but 4wd only radio shack had the long chassis and all were 4wd which i believe they did all on their own. The tandy corporation i saw is i believe who was in charge of that. I think they might have built them elsewhere but they were designed by tandy. I do know tandy also manufactured leather in dallas too, i cant see why they wouldnt do their radioshack cars here as well.