I built this tandem trailer frame using a nothing but a hacksaw. Just after that i took several arm wrestling championships in my class. :vs_laugh:
All jokes aside, cut within a few thousandths of being through on the 4 sides concentrating a little more on the corners, then place the cut between a couple of 2x4 blocks a couple feet apart, drive your truck on the cut area and the concrete will break. About a 15-20 minute job with a 18 tooth blade.