For 2016 it was the same. GCWR and maximum trailer weight (of unaltered chassis) are listed at bottom of this link.
http://www.fleet.ford.com/resources/...6+E-Series.pdf
Since GCWR can vary significantly with changes in rear axle ratio, I'd personally check to confirm your E-450 came with 4.56 gears. Manufacturers like Ford often offer optional gear ratios, which can be higher or lower.
On a side note, these E-450 lower 4.56 gears are probably not great for fuel economy when not towing.
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