Hi Tex,
I haven't had any issues with rolling the body on the side. The body is quite solid with the new floors and sills in and the door bracing helps as well. I originally was a little afraid to do it often but it has been totally fine. Now, if the tub was rusted and weak then that would be another story....
Yes, I will have to watch soon once I get the car exterior ready for paint. At that point, there will be no more rolling over of the body. Everything that will need to be done on the underside will have been done allready. So, rolling the body is coming to an end.
Oh, I should mention one critical thing. If you notice my bracing, it sticks out a couple of inches from the side of the car. So, when rolling, the car actually sits/slides and is protected by these side bars. It protects the outer sills and the edges of the wheel wells etc.
Cheers,
Tush