It depends on who you ask. When trusses are built, the buyer designates whether or not to add stiffness to the bottom chord. When they are designed as such, you normally see a 2x6 bottom chord. If they aren't designed for attic storage, then the sheet set that comes with them includes a placard for the builder to nail to every other truss stating that they aren't designed for storage. If those placards are installed, liability is no longer on the manufacturer or the builder. That being said, as the trusses are installed, I have come across situations where three carpenters are standing on the same bottom chord, jumping up and down, to get it to go into place. You also see people storing things in garage rafters all the time, without a problem. My intuition is that christmas lights and the like would be no problem. Any more than that, I would ask the manufacturer for reccomendations for strengtening them. They will probably tell you to sister each bottom chord, and add plywood gussets to each gusseted intersection. Sometimes they even want you to carriage bolt everything in addition to nails. Hope this helps.
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