Determine the largest weight of the crate that can be supported

Book: http://amzn.to/2i8HBOO More videos: http://www.forthesakeofeducation.com Become my official student:   / daxterbels   If the tension developed in each cable cannot exceed 300 lb, determine the largest weight of the crate that can be supported. Also, what is the force developed along strut AD?