I've tried this a few times and I do it a few folders objects a time to keep from crashing. Though when I do manage to purge all the things in my trash they always reappear the next time I log in. I don't know what I may be doing wrong though I suppose it's something? Just like to pass this along in case anyone knows how to actually get rid of all my trash that I honestly don't need or want any longer.
On a side note. Does trash add to the inventory load until it is purged? I hate to assume though I suppose it does in somewhat since it's still actually there.