I don't know why tents would add to stealrth skill. Maybe if you were inside the camo tent, but not the others. It just makes you a sitting duck. Also, for storing items are you referring to a storage item or a facility-type implementation? because either creates its own problems. It has to be deployed like weapons or bacta tanks.
There's no implementation for tents yet because I don't know if Sel and the group don't know what to do with them yet. Considering almost all the items in the game were added before any kind of solid development plans could be created, its no surprise there are few plans for items that the admins are trying to find a use for, as opposed to adding what is needed. Who knows, tents could just be removed like ammo and so many other badly implemented items.