ELI5: Explain Like I'm 5

truck bolster

Ok kiddo, so imagine you have a toy truck with a flat bed on top, and the wheels underneath. The truck bolster is like the part in the middle that holds the bed and the wheels together. It's kind of like the truck's backbone, or the spine that keeps it strong and stable. Without a good bolster, the truck wouldn't be able to carry heavy things or drive smoothly. So, just like you need to take care of your own spine by eating healthy and exercising, a truck needs a strong bolster to stay healthy and work well!