system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why flat bed tow trucks use beds with a little bit of an arch to them - instead of being truly flat.
gpt
The built-in arch compensates for the sagging due to heavy loads on the bed. So when the load is applied, the bed of the truck wants to be flat, instead of sagging down. This is more important for large trucks than it is for pickup trucks, say, because of the length of the bed.