Whoa...
Now there's a guy who takes his fuel system seriously!
He's got more invested in just the shocks than I do in my entire TRUCK.
I'm betting that with solid body mounts and the cage being welded both the the body AND the frame, it'll beat the living sh_t out of you, even with the suspension seats.
I like the longer F150 rear spring idea, though - I might try that when I get around to installing the D60 in the rear of mine.