This trick can only be done once you've reached the Fangorn Troll boss fight. Fight the big troll and the little troll, using the health font in the upper right corner if you need to. Once you kill both trolls, they should drop items. Since this is a boss fight, the items tend to be of better quality & more rare than usual. Collect the items, then save. Load up the save to fight the trolls again. Do this as many times as you want/need to get really good stuff. I myself, after many attempts, got the Glamdring "Unique" sword for Gandalf, as well as other good stuff for both Legolas and Aragorn. It's best to do this at a really high level, like 30+ to make the actual fight easier. Having Ent Water also helps. Make sure you are fully healed before saving.