I was re-reading part of this when something occurred to me (again but I forgot to post it before) and that is the front beam mount is set at something like 6 degrees which is part of the reason that when you rotate the pan on the rotisserie, the front wheel of that mount wants to lift.
Also, the rotisserie mounts for the trans mount which (I suspect) is designed for some deflection due to the weight of the engine and the trans, so the mount also has some angle built into it also which can cause the rear wheel to take up the angle like the front mount does. The pan spreads the load so the two angles can cause extra work when rotating.
