Nothing needed that I'm aware of. ST tires should be inflated to maximum cold sidewall pressure anyway. Even if they flat spot you'll never know as no one is riding in the trailer. Been winter storing boats, campers, and cars for decades without problems regarding tires or suspension. YMMV.
If the gravel bothers you a few, probably four, 12" square concrete pavers placed where the tires will end up will put them on a smooth surface. Buck and a half (each) at Lowes.
-- Chuck
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2006 Roo 23SS behind a 2017 Ford Expedition
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