One time I had to brake the opposite tire and nudge the misaligned tube tire by gently lurching the clutch a few times. It spun the rim while the tire and tube stayed put. Keep in mind we're only talking about a couple inches of rotation.
That is an immense amount of weight causing friction tube/against tire. I don't know. But I would HIGHLY doubt the tube moves within the tire. Sometimes I forget though, what size tire is being talked about.
Possibly, the tube was folded over or twisted when installed. I usually inflate and deflate a tube several times to hopefully have it properly deployed within the tire. Many valves actually are not even at the right angle for the rim since rims have various steps and valve positions.
I haven't had a chance to try moving it yet, due to busy schedule. I'll certainly let everyone know what happens.