mainer,
I have no problems with the rubber keepers. In fact, I think they do a good job keeping the chains on without being too tight. As long as they are in good shape, but they can obviously get damaged in deep ruts.
I have seen Toyo M55 sidewall rubber split from chains being too tight. That stated, the cams can do just fine as well but I think some people tend to overtighten chains in general.
I also ran into a similar situation with Warn hubs, but that was quite awhile ago. I ended up using Superwinch hubs. The guys at the 4x4 shop laughed when I asked for Warn and showed me the differences.
