Lionel,
A solid Besser block on its side in each corner, dug in almost flush with the ground surface, is all you need to support the container. No need to mix concrete and caste special pads. The gravel only needs to be about a foot or two wide, if you use any at all - under the container (if mounted very close to the ground) does not get light and therefore does not support weed growth, only around the edge, which can be hit with a whipper-snipper (weed whacker) from time to time.
Mike
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