Also, I realize you have the long arms to deal with. I use a long 1/2" breaker bar to loosen the plug. If you can get a wrench on it, you might be able to get something on the wrench (e.g., a pipe, a box end wrench) to get some leverage. Another trick is to use something (e.g., a piece of wood, pipe) to put on the wrench and then hit with a mallet or hammer.