A through-body porcelain with a PEI of 4 or 5 and a reasonable COF when wet should work fine. You may want to consider an epoxy grout, or use a grey grout, since it is likely to take on that color anyways otherwise. Whlie tile is brittle, if it is supported properly it will stand up to the car or whatever parked or placed there as long as it is a decent floor tile. Just watch out for the coefficient of friction, probably both wet and dry.
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Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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