Big Rigs

"Big Rigs" are also known in the USA as "Semi Trucks" or "Tractor - Trailers", and in the UK as "Lorries".  No matter what you call them, these are large multi-axle commercial vehicles.  In general, they represent the largest, most complex models that Technic has to offer.  This catergory is unique in that every single one of these models is also in another category.  The reason for this is that these trucks really have nothing in common except the basic subject matter of large trucks.  Therefore, features vary widely from model to model, but all have a wide range of impressive features (except for 8433).  Features range from pneumatics to dampers to crane arms to dumping beds.  Several have motorized features.

Picking a favorite is very hard here.  Each of these could be a favorite in its respective category.  8285 is the biggest, 8479 is the most unique and versatile, but if I could only keep one, I would pick 8868.