I found the calculator i used on google as well. Nutty We located a 28' x 4' sidewalk about 6 years ago. Bobcat was a no go. Too much leverage.
No worries, we're all tryin to help with the same thing. He might be able to at least get under the slab with a bobcat and strap it to the forks and drag it but that would very much limit the maneuverability. New slab is probably the easiest way to go.
