Check out PORTABLE CASTER WHEELED DIESEL ENGINE POWER GENERATOR SET GENSET 3D model on CGTrader for $32. High-quality mesh by SURF3D: 749202 polys, 602131 vertices.
STL (Stereolithography, filesize: 35.7 MB), OBJ (OBJ, filesize: 72.9 MB), 3DS (3D Studio, filesize: 21.6 MB), BLEND (Blender, filesize: 66.1 MB), DAE (Collada, filesize: 120 MB), GLTF (glTF, filesize: 23 MB), SAT (3D ACIS, filesize: 54.5 MB), 3DM (Rhinoceros 3D, filesize: 87.5 MB), DWG (AutoCAD, filesize: 16.2 MB), IGE (IGES, filesize: 71.4 MB), FBX (Autodesk FBX, filesize: 21.9 MB), STP (STEP, filesize: 36 MB), SKP (Sketchup, filesize: 45.5 MB), MAX (Autodesk 3ds Max, filesize: 144 MB)