Oddly enough I love TTB trucks... Ford's little bastard child. My only thing is flex isn't wheel travel. Those trucks can do ton's of shit my old SLA couldn't dream of. That is why I went SFA. I personally see no reason for SAS'ing a TTB short of 37" tires or true blue rock crawling. Which is were
flex comes into play. There is a reason you don't see pro rock crawlers repping up D50 TTB's converted to coil overs and what not. Strong as they are they still don't behave like a SFA. They get wonky on rocks (and in high speed corners).
Want a shit ton of travel out of a TTB? Go to light weight XJ coils. They compress great under Ranger's even the SAS'd ones. On top of that get a good set of long travel shocks and extended radius arms I would do flex joints on the frame end but thats me.
Will it act just like a SFA? NOPE. Will it act a million times better than the stock TTB? YEP. Will it accomplish what 90% of the members of this forum need? YEP.
And if anyone is curious big chunk of my assholyness stems from popping major pain killers for recent surgery on a previously shattered wrist and ****ed up back. Not an excuse just an FYI.