I'm wondering if there's some tool available like a 5 foot long pry bar, something with a tip angled so you can jam it under and then push down for leverage. I'd call a tool rental place and see if they've heard of such a thing.

Perhaps you could find an old beat up shovel and cut off most of it so that you had 3 or 4 inches of it left, then sharpen that up some so as to jam it under. Will be pretty big job, that's certain.

If you get tools that work almost sounds like a good candidate for hiring a couple of day laborers.

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1986 300SDL, 362K
1984 300D, 138K