Question about roof trusses, atic space and how much weight?

I have a newly built 26 x 30 foot garage. The trusses span the 30 foot width. I ordered trusses that left me a bonus room of sorts down the center. The bonus room is about 5'6" tall down the center and tapers down at a sharp triangular angle to about 8 foot wide. This was designed to give me a lot of storage room above my garage. My question is, just how much storage can I place in there? Should also mention the flooring is 3/4" plywood in this bonus room area. My trusses were placed 24 inches on center, please keep in mind they span 30 feet to the outer walls. For this 30 foot span there is no other support system, no beams or anything of that nature just the outer walls and what I ume to be well designed trusses. So some piling in my lifetime aculation of excess "attic' stuff it occurred to me that this is getting to be quite heavy. Is this something I need to worry about? Or can I just keep pile on the stuff in there? Thanks!