and this vehicles I mentioned
http://forum.imcdb.org/forum_topic-7628-56481-we_keep_this_vehicles_.html#p56481

technically speaking they are not vehicles but rather motorized attachments , they need to be attached to a trailer

this is how they look on their own !! you can see they can't be driven on their own..

https://b-a.d-cd.net/8ba284u/480.jpg
http://agrobiz.net/modules/text/images/200_200_970_favoritmbb5.jpg
http://www.motorsich.com/image.php/2255-mb8.jpg?width=250&image=/images/article/2255-mb8.jpg