Musings on Tires as "posts" in a Post and Beam Foundation

So I would like to use tires for my shed foundation.
I don't want to pack them in the "traditionally" way, it's too labor intensive.
I don't want to fill them with concrete, it's too expensive and still labor intensive.

So here are the ideas I want to run past you.

First, one side wall of a tire is cut off to facilitate filling it up.
Holes are drilled into the remaining sidewall. and it is pinned to the ground with rebar.
It is packed full with dirt.
A second tire with one side wall removed  and the tread cut into flaps, is put open side over the first, and nailed in place through the tread flaps.
One rebar pin is driven vertically through the dead center of the filled tire, a few more on angles.
A cement cap is poured.
Bits of tread are used to level differences between one concrete cap and the next.
The beams are drilled to accept the rebar pins, and placed over them.

"Holes are drilled into the remaining sidewall. and it is pinned to the ground with rebar.
It is packed full with dirt."


You cannot guarantee the compaction of the dirt at this foundation level of the building.
Might be 1/8" to 1/2" sinking of this layer over the first year.

If your building can account for the minus vertical movement over the year, continue on.

I was hoping that the footprint of the tires would be enough to stop sinking.
It might be worthwhile to spend the effort required to do some  prep of the ground underneath them.
I simply can't justify the effort it would take to dig a full frost depth hole in the soil at this site.
Perhaps if I dig down  to the first layer of rubble i will improve the stabilty.
Either way, the building should be fine with some settling, and corrective measures should be relatively easy.