Check out POWER ELECTRIC MOTOR HAND TRUCK DOLLY HANDTRUCK STAIR CLIMBING 2 3D model on CGTrader for $36. High-quality mesh by SURF3D: 681112 polys, 543129 vertices.
STL (Stereolithography, filesize: 32.5 MB), OBJ (OBJ, filesize: 62.6 MB), SAT (3D ACIS, filesize: 49.7 MB), FBX (Autodesk FBX, filesize: 20 MB), 3DS (3D Studio, filesize: 14.3 MB), DAE (Collada, filesize: 111 MB), 3DM (Rhinoceros 3D, filesize: 130 MB), MAX (Autodesk 3ds Max, filesize: 146 MB), SKP (Sketchup, filesize: 64.3 MB), STP (STEP, filesize: 54.1 MB), GLTF (glTF, filesize: 21.5 MB), IGE (IGES, filesize: 91.5 MB), BLEND (Blender, filesize: 59.3 MB), DWG (AutoCAD, filesize: 20.5 MB)