Chevrolet Low Cab Forward 4500 2019 Series Owner's Manual page 61

60 Storage
Cargo loading caution Incorrect Correct
Use ropes and tarpaulins to secure the cargo so it does not fall off the
cargo bed. Use rubber bands or bungee cords to prevent the tarpaulins
from flapping in the wind.
Avoid loading cargo too high. It can cause the vehicle to tip sideways
when it catches side winds and when turning the vehicle.