Medium Size Box Truck Low-poly 3D model is available on CGTrader for $18. Original author: rescue3dcom. Specs: 5055 polys, 3170 verts.
BLEND (Blender, filesize: 447 MB), OBJ (OBJ, filesize: 536 KB), FBX (Autodesk FBX, filesize: 771 KB), MAX (Autodesk 3ds Max, filesize: 789 KB), MA (Autodesk Maya, filesize: 173 KB), GLTF (glTF, filesize: 29.3 MB), DAE (Collada, filesize: 864 KB), 3DS (3D Studio, filesize: 360 KB), TEXTURES (Textures, filesize: 29.6 MB), UNITYPACKAGE (Unity 3D, filesize: 14.1 MB)