The package contains only meshes (fbx) and tga textures so it should be compatible with different versions of Unity!

Vehicle, 16.455 verts, 28.046 tris, 3 separated meshes, no lods, simple color texture (only color mapping + some details):
- Body: 12.229 verts, 20.759 tris
- Interior: 4.134 verts, 7.201 tris
- Glass: 92 verts, 86 tris

4 x Wheel:, 3 lods, color + NM:
- lod0: 8.808 verts, 16.448 tris
- lod1: 4.660 verts, 8.552 tris
- lod2: 1.364 verts, 2.216 tris

Vehicle + Wheels combined:
- lod0: 25.263 verts, 44.494 tris
- lod1: 21.115 verts, 36.598 tris
- lod2: 17.819 verts, 30.262 tris

Harvester Head, 11.312 verts, 15.090 tris, 2 separated meshes, no lods:
- Main: 7.004 verts, 11.178 tris
- Blades: 4.308 verts, 3.912 tris

Trailer, no lods:
- 666 verts, 1.128 tris

4 x Wheel, 2 lods:
- lod0: 4.608 verts, 7.936 tris
- lod1: 2.848 verts, 4.736 tris

Trailer + Wheels:
- lod0: 5.274 verts, 9.064 tris
- lod1: 3.514 verts, 5.864 tris

Extension altogether:
- lod0: 16.586 verts, 24.154 tris
- lod1: 14.826 verts, 20.954 tris

Game ready meshes! The vehicle is rigged. Wheels are separate meshes/objects.

Realistic proportions, realistic scale in Unity3D (import scale 100).