Timbrens don't engage the stops until the rear end has come down about two inches. You would probably, still have more squat than you like.
My 08 F250 has a factory plow prep package. It had a bit of a squat, even unloaded. I was browsing a Super Duty forum and saw where other folks had fixed that problem by replacing the rear spring blocks with a set for an F350.
F250 blocks are 2 inches tall. F350 blocks are 4 inches.
I did the swap. My rear end, went from being an inch low to an inch higher than the front. I also did the Timbrens, but, that was for increased stability for carrying a truck camper.