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In addition to keeping an eye on uneven treadwear at lower pressures, I would be concerned about bending wheels. The lower the air pressure the great the likelihood of bending a wheel, ceteris paribus. Just food for thought.
If I were you I would ensure the stock suspension is in good condition and use soft-sidewall tires. Moving from 18s to 17s would help, but not a ton. The difference in sidewall height between those two (assuming proper tire fitment) is pretty minimal.
18" sidewall height is about 3.7"
17" sidewall height is about 4.16"
That's a difference of about 12%
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