Measured from forward leaf spring mount to the rear lower control arms both length and corner-to-corner to check for square of the frame there. Then did the same from the upper shock mounts to the upper control arm locations and used plumb lines to check distance between the lower and upper rear reference points to check the upper and lower numbers against each other to check for twist. The frame has definitely been tweaked slightly, but not bad by a good measure. Adjusted the upper mounts slightly and will dial the rest in with alignment.
