I have a staircase going down a small hill in my backyard that was built using rebar and railroad tie. The whole staircase was burned in a recent fire and now needs to be replaced, and I'm trying to find a way to replace it without costing a fortune. 1. One contractor suggested using concrete, though I am concerned with concrete cracking due to the ground shifting. I also live in possible earthquake country in S. California. Thoughts on using concrete if I put something else on top of it, like pavers? Would there be possible issues with concrete cracking underneath the pavers? 2. Another contractor suggested using Roadbase gravel and decomposed gravel and putting pavers on top glued down. The idea behind this was not to use concrete because it will crack. Thoughts on this approach? 3. Any other suggestions for handling this based on the two previous recommendations? Thanks!