Extended the box on the Retriever to look more like the real life "Longbox" edition

V3 UPDATES:
- Animations for tipping now work
- Animations and controls for loading bed back door now work
- Third tension belt added
- Hitch Working
- Utility Version Added (See Below)

Utility Version: Modified the Retriever to include Skidder Attachments and act as a utility vehicle for transporting bales/pallettes.
- Rear Hitch for weight attachment
- Front Hitch for tool attachment
- Lift Key (V) for rotating tools into Driving mode