On the older units like my 2013, there were plates added on the side of the frame by the spring hangers to beef it up. Could that be what you are looking at?
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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