Check out Tracked wagon 3D model on CGTrader for $39. High-quality mesh by dannymax0000: 115004 polys, 85022 vertices.
STL (Stereolithography, filesize: 5.48 MB), OBJ (OBJ, filesize: 8.02 MB), 3DS (3D Studio, filesize: 4.05 MB), FBX (Autodesk FBX, filesize: 4.3 MB), MAX (Autodesk 3ds Max, filesize: 12.1 MB)