ya ive seen the dually but hate buying online and the 2 hobby stores i have availible dont carry them,the trailer kit has a recivier for a truck and have seen semis haulin big race trailers before so think i will go that route alwyas wanted to try a semi build anyway,thaught i had the 5th wheel box was markd wrong,but the hobby store i bought it at had plenty more so will be getting another, thanks for the comment and car was nothing special just a car i had sitting around, have 2 thunderbirds and a few montes workin on now