I also purchased this cutoff wheel instead of the metal grinding disk.
I didn't try it because I thought it was thin to cut through such heavy metal. Maybe that's not true?
Roadrunner: The reason I chose the AG method is that I don't have anyone to help right now to do the bolts from beneath. I did see one post where they cut through the tops of the bolts like a cross and then used an air chisel. I tried the AG, as I had it already. I looked for an air chisel at Lowe's but they had none.