Hey Polartuner,
Tiling is definitely possible. I did it in the bathroom of my showhauler and have not had any cracks at all. You have to do it a certain way, though. First, start off with 3/4 plywood that's screwed down very well. Then put down either 1/4" durrock, hardie backerboard or wonderboard. Make sure that you set it in thinset using the recommended notched trowel and screw it down every 8 inches around the perimeter as well as the field. Then thinset your tiles and grout. That's about it. I would choose tiles that are no larger than about an 8x8 just to be safe. Conventional motorhome manufacturers have been using ceramic tiles and have also used granite and marble tiles also. Good luck.
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