Liberty Ship Cargo Vessel (Polygon mesh 3D model) is available on CGTrader for $59. Original author: HighRock. Specs: 536595 polys, 285786 verts.
STL (Stereolithography, filesize: 32.1 MB), OBJ (OBJ, filesize: 28.8 MB), MAX (Autodesk 3ds Max, filesize: 23.5 MB), 3DS (3D Studio, filesize: 7.16 MB), DXF (DXF, filesize: 32.1 MB), DAE (Collada, filesize: 14 MB)