I'm glad you two have installed these FSD and started to evaluate them. And not from a "better you than me" standpoint. From knowing you'll both evaluate and report thoughtfully.
I'm already re-considering what I was going to do:
From: HD Bilstein Front and Rear
To: New Ford Shocks Front and FSD Rear - my "axle kit" came with a pair of unused 2012 front shocks from E450 that Quigley was converting to 4WD for Jayco. From your comments so far, seems the Rear would benefit most from FSD's. We hear the Rear more than we feel it, with that 218-inch WB.
Again, THANKS!