You must have better ground condition that I: T posts will not hold a 4 foot high stack of split wood in my ground - at least not for the long term. I started with at 11-12 foot row of pallets with T posts on either end of the two rows I stacked on them. The posts started spreading within a couple of months.
Generally, I’d lose about half the posts within a year or so. If I ran a rope across the top to tied the posts together, they help up much better (though the rope gets in the way when stacking.
You are reminding me of the 3 nightmare winters, when I stored my firewood outside on pallets, under tarps. I su
would not burn firewood, if I ever had to do that again. I never tried the t-posts, but I would alternate directions of the firewood on the ends of the stacks, to keep them “square”.
What a pain that was, trying to sort out appropriate sized pieces. That was minimal, compared to the pain of dealing with the tarps in the wind and under the snow. I had been spoiled by many years of storing firewood inside an old, well-weathered timber-framed dairy barn that my great great grandad had built, shortly after the Civil War.
I had to take that old barn down, to clear a spot for my new pole barn, a few years ago. The three years between that takedown, and when I built the woodshed on the back of the new pole barn were awfull, concerning storage of firewood.
We get so much rain here (dead center between two Great Lakes), that the outside storage of firewood don’t work well at all.
This new woodshed works great, with 8 ft 2x6’s on the outside edge, to hold up the stacks.