It's not hours of geometry - you simply lower the beam pivot point the same amount as the height of the lift in the coil. If you don't build extended or longer radius arms you should lower the radius arm mounts too.
Now the reason many people don't do this is there is a LOT of leverage on the beam pivots 7 extending them 4" is like using a longer handle or lever on a wrench or ratchet = MORE torque applied to the end. You have to gusset the **** out of them & make them REALLY strong to get them to live 5 minutes...
i do believe that AutoFab uses a 100 ton press. i have heard of guys heating and using a huge cheeter pipe to bend, and i've seen guys "pie cut" in multiple places, bend to desired deegree, than weld up cuts and plate.
First we inspect the king pin end then straighten the I beam. We have a 100 ton press in our shop to accomplish this ! 90 percent of the time the beams are tweaked from hitting a curb or ditch and even previous bending at alignment shops. Their common practice is to bow the beam to correct minor camber changes. -Autofab