I need a free sound byte (perferably .wav formated file) of a large
rock rolling. The gravel sound of a large rock, likened unto an Easter
pageant where
the rock is being rolled shut. It should be slow and of decent length
(2 min).

Would the sound of a heavy truck on gravel do, if there were no engine noise?
I don't have a sound track for you, though, just an alternate suggestion.
Maybe you could "tape" it yourself.
Two minutes, that seems very long ...
'nother idea:  find a stonemason near a cemetery with a gravel patch ...
Good luck, time's running out ...