Cement backer board vs. plywood
I'm planning to tile the entry of our bus (not using a traditional mortar/grout application, so cracking or buckling of the tile itself should not be an issue). It's a vertical surface with bolts sticking out 1/4", so I can't apply anything directly to the surface, and need to build it out slightly.
In most residential applications, cement board (hardiebacker) would be used for this. Has anyone had problems with cement board cracking in a bus? It is cement-based, after all, and the entry will see quite a bit of movement and traffic. We're more familiar with using hardiebacker, but if I find out cracking is a problem, we can always use ply.