Lego MB Actros tipper truck - dumping, switching mechanism

It is a 1 to 17 scale model of the new Mercedes Actros tipper truck. It was a big challenge to build it, because it has 8 function, operated by only 2 Xl motors. Another 2M motors switch between the functions. It uses only the electronic of the lego set #8275 pictures: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=422579