In my case, the back end of the rail is supported by a rail holder, which is screwed to the wall. Putting a hole in the inner skin of the wall won't cause any leaks. The wall is quite thick, so your sheet metal screw should protrude from the back of the rail holder by about half an inch. Just be sure you don't make the screw so long that it pierces the outer skin of the TM.
No, there should be no warranty implications as long as you don't penetrate the outer skin. Of course, if you do make a hole all the way through, and the hole leaks, that's another story.
Bill
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