Truck crane 3D model is available on CGTrader for $5. Original author: AlexMas1981. Specs: 243296 polys, 229316 verts.
STL (Stereolithography, filesize: 22.4 MB), OBJ (OBJ, filesize: 34.1 MB), 3DS (3D Studio, filesize: 13.9 MB), FBX (Autodesk FBX, filesize: 10.5 MB)