Route to Developer Shit-House
I just recently found about another spot to easily farm on, which is also quite early in the game.
You will reach Three-Horns-Divide after killing Flint with the mission to enable the Catch-A-Ride System.
Close to this you will find a bandit camp (Windbreak Camp?) and while killing my way through I spotted some sort of cliff running upwards at the back side of this camp. When running through this camp you ideally stick to the lefthand side, from there the cliff is easy to spot.
Running the cliff upwards, making a bit of a turn to the right, you will fnid a ladder to climb up, and there something I like to call the 'Developer Shit-House'.
Remember, you will usually be around LVL 8 when reaching this spot, and this Shit-House will ALWAYS come out with LVL11 items. Which is ALWAYS as in 100%. I did loot the spot about 30 times, able to acquire Classmods, Shields, Grenademods, weapons, even Rocketlaunchers, all LVL11.
I do not know if this spot levels up with your char, or what LVL items may be looted on a 2nd playthrough, but I am really sure this has to be some Developer Spot. Which also means, not only chests can be Dev-Tagged...
And even if you do not need what you will get out of this shithouse, since the ammo and med vendors are close by, you can easily sum up cash for later use....