I posted this in another GPS thread, but the content is relevant here as well. Liquipel is a company that uses nanotech vaporization to "watersafe" your phone or tablet. I saw their display at the Consumer Electronics Show last January and it really works well. They had an iPhone in the "on" state sitting in a little waterfall as part of their display.
This technology would work really well on your tablet to allow you to put it on a RAM mount. Unfortunately this doesn't address the tablet's vulnerability to crashes. You would need a robust case for that.