We do not publish a weight capacity for the 1904-3-02 (or any of the cab screens). When we do not publish a weight capacity for something, "reasonable" care must be taken not to overload the product. This unit is designed to protect the top of the truck cab by having longer items secured to it instead of having them leaned up against the truck cab during transport. It is reasonable to assume that leaning up to a 70 pound ladder or equivalent weight in building materials (e.g. lumber, piping, etc.) will not overload a correctly mounted 1904-3-02.