PT 4x6 as shed footers?

I am building a small shed. I was planning on using concrete blocks in the corners as footers, but neighbor has put out some PT 4x6s and I am thinking they would be better.
I know they will rot out eventually, but 20 years is certainly long enough for this project.
Does it make sense to put the shed on a little box made of 4x6s? The ground is a thin layer of dirt over solid shale, so it should be pretty stable.
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toller wrote:

Perfectly acceptable. Around here, almost all portable buildings are build on skids of either 4x6 or larger for bigger buildings. Makes it easy to move if the need arises.
--
Robert Allison
Rimshot, Inc.
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"toller" ( snipped-for-privacy@yahoo.com) writes:

I did mine this way 17 or 18 years ago and no problems yet.
Jonathan
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It's a normal process but against code where I am. May be legal where you are.
Jeff
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