attic space

Originally my garage was open ceiling, previous owners covered it up with drywall.
I have a access to the attic area, I took some of the measurements. Also my roof is hip style. With the start of the hip almost center over the garage.

The rafters and joists are 2 x 4's forming the trusses. On each joists there is a 2x6 sistered to it. Running perpendicular to each joist there are 2x4's, every 12", nailed I guess to support the drywall. Also, 2 of the trusses have two "v" shape supports to the rafters. Between each joist is 4'.

Is my attic structure sound enough to store holiday stuff and other not real heavy items?
If I cay store anything, I was thinking laying flooring with supports being the 2x6's and not the actual joists.

 

Local building codes may dictate whether or not you can use this area for storage. Check with local authorities before proceeding.

"Be aware that the trusses most likely were not designed to carry additional loads on the bottom chord, if you are planning to use the attic space for storage. If this is what you are planning, you would be well advised to contact the truss manufacturer as to the amount of load the trusses were designed to carry."
http://www.woodtruss.com/faqtrussrepairs.htm (Retrieved 05/19/02)