Pick a similarly sized (width and height) to the tire next to it, and make sure it is plumb with the row below so the outside of tires are all even.
For most of the tires, we used 6 screws- 4 where the tire rested on the 2 tires under it and 2 to the tire next to it. More or less for the corners or ends.
After a good shake to be sure the tire is secure, a square of cardboard that overlaps the center by 1"-1 1/2" on all sides is folded, put inside and the edges pressed down so the dirt doesn't escape below.
When the tiers of tires got too high to dump a wheelbarrow-full of dirt in, empty cat litter buckets were the perfect solution for us. 4 buckets dumped in, then a good sledgehammering to pack it in solidly. 2-3 more buckets, and another hammering. Then with the level again, be sure the tire is horizontal across the top both ways and level with the tire next to it so that each level is fairly even across for the next level.
For the last hammering, we used a mallet that Joe made out of 4x4x7 and a dowel handle. The flat surface made a nice flat top to the dirt.
The final effect reminds me of Giants Causeway in Ireland...total of 8 buckets used per tire.
Pick a similarly sized (width and height) to the tire next to it, and make sure it is plumb with the row below so the outside of tires are all even. 
For most of the tires, we used 6 screws- 4 where the tire rested on the 2 tires under it and 2 to the tire next to it. More or less for the corners or ends.
After a good shake to be sure the tire is secure, a square of cardboard that overlaps the center by 1"-1 1/2" on all sides is folded, put inside and the edges pressed down so the dirt doesn't escape below. 
When the tiers of tires got too high to dump a wheelbarrow-full of dirt in, empty cat litter buckets were the perfect solution for us. 4 buckets dumped in, then a good sledgehammering to pack it in solidly. 2-3 more buckets, and another hammering. Then with the level again, be sure the tire is horizontal across the top both ways and level with the tire next to it so that each level is fairly even across for the next level. 
For the last hammering, we used a mallet that Joe made out of 4x4x7 and a dowel handle. The flat surface made a nice flat top to the dirt. 
The final effect reminds me of Giants Causeway in Ireland...total of 8 buckets used per tire. 
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