If you have a GMC truck with a bed cover, you may be wondering how to best use it. Here are some tips: 1. Use it to keep your things dry. If you're carrying around anything that could be damaged by water, put it under the tonneau cover. This will help keep it dry and protected. 2. Use it to keep your things secure. If you're carrying tools or other valuables in your truck bed, cover them up with the tonneau cover. This will help prevent them from being stolen. 3. Use it to reduce wind noise. If you find that wind noise is a problem when driving with the windows down, try putting up the tonneau cover. This can help reduce the amount of noise that comes into the cab. 4. Use it to improve fuel economy. When you cover the truck bed, you're effectively reducing the aerodynamic drag on the vehicle. This can lead to better fuel economy, especially at high speeds. 5. Use it to protect your cargo from the elements. If you're carrying anything that could be damaged by sun or snow, put it under the tonneau cover. This will help keep it in good condition.