Best Folding, Locking Bed Cover

[Billohio]

Friend of mines daughter has a retractable cover on her work truck and might be the brand, but it seems to get water in the box it rolls up into. The box has a drain tube and it comes off and let's water into the bed. We first thought something had rolled into the drain tubes and pulled them off. Last I heard the bed was wet again and I think he said the drain tubes are still attached. She works for Milwaukee tools and water has soaked the bags her tools were in