Here's the Kenworth T660 Tractor with Trailer. It is manufactured by Spec-Cast in 1/64 Scale.

The Trailer features the Challenger MT600C series on the side.

And has opening double doors, revealing a detailed interior.

The cab has many interesting details as well, including the Challenger decal on the air foil. 

This truck has a diecast body with very few plastic parts, as well as moving rubber wheels.