$149 M270 MLRS Game Ready Low-poly 3D model by ryzhkov-3d-models. Available on CGTrader with 98058 polys and 101305 vertices. Check it out on CGHub.
BLEND (Blender, filesize: 6.79 MB), OBJ (OBJ, filesize: 4.07 MB), FBX (Autodesk FBX, filesize: 6.98 MB), GLTF (glTF, filesize: 396 MB), SPP (Substance Painter, filesize: 948 MB), TEXTURES (Textures, filesize: 381 MB)