Try taller blocks! 4" is really not much.
NEVER have touched the air in my TrailAir pin box to disconnect. I DO set my rear air ride suspension to "tire jack mode" to keep it from trying to re level when taking weight off. I get a small gap between the pin box and hitch plate and simply pull away.
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2015 RAM LongHorn Dually Air ride Aisin 4:10's
2016 MS 39TKSB3 "Highly Elited"
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