User blog comment:GandalfTheGray1/Weapon Farming and Experience Farming/@comment-4398083-20120509152605

I suggest the Drifters in the Sunken Sea and Deep Fathoms of DLC3 for exp, and sometimes good loot (be on the lookout for erupting Drifters). Get a Monster vehicle and have at them with the guided missles. As one approaches lvl 69, each Drifter killed can be worth 12,000 - 13,000+ exp each. And there will be a lot of them.

If one has completed the Claptrap DLC4, then you have unlimited access to the Tartarus Station's Hyperion Corporate Gift Shop with 18 red chests, and no opposition. Just keep restarting. And Tartarus Station itself is a cornucopia of loot in itself, including the adjacent Scorched Snake Canyon.