I found a ledge glitch spot that has worked every time for me. A ricochet weapon is required to make use of it, though, and sadly the Thunder Storm's projectiles don't have enough range. I believe the Madjack works, though I use the Orion sniper.
Basically, run due SW as soon as the elevator reaches the top, and aim for a little bump in the rock ledge. Crouch as soon as you get to the edge of the upper level to avoid slipping off the ledge and so that Crawmerax can't see you. You may still have to deal with a minion or two. After you take out his frontal crit spots, you need to stand up for a few seconds to get him to move toward you enough that you can ricochet bullets off the rock formation to the right. This takes a bit of practice and should probably be done in several stages, just moving him a little bit at a time and then checking to see if you can hit him with ricochets.
![](https://i.ytimg.com/vi/CoqHp6JdR1A/maxresdefault.jpg)