Do cabs vary much in the construction or rigidness from year to year?
In a few other posts I have read about handling the cab when it`s off of the frame with basically kid gloves.
I have a 1964 cab and I haved moved it a couple of times and it seems pretty rigid to me.
I would think the manufacturer designed the windshield posts to be fairly strong and as far as the cab twisting, the floor seems to be extremely rigid, even with the cab off of the frame.