Dexter...you can use a 1/4" backer board to save on weight, there are two companies we use, Handi Backer and Easy Board, we perfer the Easy Board because it seems to move less which will result in a better tile job and less grout cracking. Also be sure to use a thinset that is a fleixible set, because of the viberation and coach movement. A layer of flexible thinset under the backer board is also recommended..a good quality latex additive for the grout is a must also..no water....good luck.
Make sure the 1/4" backer board is secured to a min. 3/4" sub-floor and it is tight.
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