"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.