The Underbody refers to the body or the structure of a vehicle’s underside. It is where the mechanical components of your vehicle are bolted or mounted like your fuel cell.
To ensure your vehicle won't suffer from chassis, exhaust, and other vulnerable mechanical damage, it's important to keep your underbody clean and rust-free. Out of sight, out of mind, they say but there are many accessories and armour available to protect your vulnerable underbelly and offer more fuel and even water storage under your vehicle.