$23 AUTONOMOUS FIRE FIGHTING ROBOT VEHICLE EXTINGUISHER SPRAYER UGV 3D model by SURF3D. Available on CGTrader with 483291 polys and 450032 vertices. Check it out on CGHub.
STL (Stereolithography, filesize: 23 MB), OBJ (OBJ, filesize: 44.6 MB), 3DM (Rhinoceros 3D, filesize: 133 MB), BLEND (Blender, filesize: 44.1 MB), DWG (AutoCAD, filesize: 36.2 MB), STP (STEP, filesize: 78.8 MB), 3DS (3D Studio, filesize: 15.1 MB), MAX (Autodesk 3ds Max, filesize: 144 MB), FBX (Autodesk FBX, filesize: 14.7 MB), SAT (3D ACIS, filesize: 124 MB), SKP (Sketchup, filesize: 135 MB), IGE (IGES, filesize: 97.9 MB)