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Would like to install some kind of lift pulley system to aid in moving light storage to my attic. Already has a floor and the trusses can withstand up to 25 lbs psf on the bottom cord. How do I determine how much the upper 2x4 joists of the trusses can handle. Would like to put a cross brace across 2 of the trusses to support the weight of the lift pulley. Thanks for the help. :wallbash: