$85 Claas Xerion 5000 Tractor and Joskin Trailer Low-poly 3D model by ultra3dmodels. Available on CGTrader with 3256 polys and 2589 vertices. Check it out on CGHub.
OBJ (OBJ, filesize: 8.83 MB), C4D (Cinema 4D, filesize: 5.16 MB), FBX (Autodesk FBX, filesize: 69.6 MB), JPG (JPG, filesize: 98.8 MB), BLEND (Blender, filesize: 181 MB)