Combine Harvester 2020 (Polygon mesh 3D model) is available on CGTrader for $139. Original author: 3D-Horse. Specs: 1695544 polys, 1735554 verts.
OBJ (OBJ, filesize: 60.1 MB), 3DS (3D Studio, filesize: 32.4 MB), C4D (Cinema 4D, filesize: 29.5 MB), LWO (Lightwave, filesize: 35.3 MB), MAX (Autodesk 3ds Max, filesize: 94.5 MB), MA (Autodesk Maya, filesize: 69.6 MB), HRC (Autodesk Softimage, filesize: 48.7 MB)