Bed Disassembly question

[402Bowtie]

I have my '72 bed off the frame and am now trying to completely disassemble it. I have every single bolt off and now am stuck trying to cut through the spot welds at the rear of the bed. I have a grinder but can't get the right angle with it. I also have tried a hacksaw and drill but they take tooooo long. I have thought about using a cutting torch, but I am afraid of over doing it. Any suggestions would be greatly appreciated....Thanks...John