I struggled for ages with Pizza, Oil cans, and Bobbleheads. I then learned about the hut in the corner of the Minac area, at the end of the dlc (Outside Fyrestone). Just hide in the hut, then go have a cup of tea. I got bored, so shot all the gatling turrets off the minac, and just farmed the exploding Claptraps. 20mins later, I had collected everything I needed. Wish I had learned this before many, many dump runs.