Peter, (Framingham, MA)
In my opinion, the only acceptable way to correct this situation is to redistribute the weight if possible and add leaf springs instead of a solid block. In some cases, air bags can help. The block that was added is not resolving the underlying problem, as it did nothing to redistribute the weight. The result can indeed be poor handling issues, as you have indicated.
In addition, frame damage, abnormal tire wear among other ailments, may still be in your future. My concern here is that, although your vehicle no longer tilts to one side, the fundamental problem was not addressed, which can, and likely will, lead to other problems.
I highly suggest you take your coach to an experienced frame shop and have the suspension evaluated fully. Recommended repairs may include additional leaves in the springs, a sway control bar and/or other aftermarket improvements. But the evaluation must be performed first.