Manuai/User Guide
 
            TopUp is designed to be the most useful truck bed cover for today's pickups. We designed the linkages by applying engineering principle of parallel bars and four-bar linkages. And these exclusive linkages make TopUp on top of today's truck covers.
            The basic function of lift-up and lockable allows you to store items in the bed and keep them out of sight and out of weather. By simply one man operate process, you can lift up the cover plate and make it becomes a roof which give you the extra space of a truck
            With this function, you need to lock the linkages with 6 locking pins and you can drive your truck as normal.