Rottne H21D - Forestry Harvester (Polygon mesh 3D model) is available on CGTrader for $139. Original author: markos3d. Specs: 24546904 polys, 12623282 verts.
STL (Stereolithography, filesize: 354 MB), OBJ (OBJ, filesize: 265 MB), C4D (Cinema 4D, filesize: 188 MB), MAX (Autodesk 3ds Max, filesize: 58.3 MB), FBX (Autodesk FBX, filesize: 248 MB), 3DS (3D Studio, filesize: 103 MB), LWO (Lightwave, filesize: 430 MB), HRC (Autodesk Softimage, filesize: 459 MB)