Hi Steve,
PC-USA does not change out the Ford shocks unless requested by the customer.
I am not sure about the 2012 E350 chassis, but the 2007 E350 chassis we own, the original Ford shocks were considered "heavy duty", but were inferior compared to Bilteins-RV and Koni-RV. I compared 2007 specs and the E350 cut-aways were equiped with the exact same shocks Ford installed on their E250 van. So take that bit of information for what it's worth.
Our 2007 E350 2350 has Koni-RV adjustable shocks that we had installed as part of an over-all suspension upgrade, done after we took delivery from PC-USA. Because so much changed all at once, I can't compare just the shocks, only the over-all change which was miraculous. Our shocks are set to stiffest for best handling so the ride is not as cushy as could be. I never tried them set to soft because changing the setting involves dismounting them.
I would hold off on new shocks only because Koni is coming out this year with their best motor home shock called FSD. They change as conditions change, soft when they can be for a smooth ride, and hard when they need to go into heavy-duty mode. It happens internally within the shocks, occurs instantaneously. FSD shocks have been available for class A motor homes for many years. They are finally coming out with ones for the E350/E450. I would wait for them.