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I can tell you that tile is a bad idea for running a slide out over. Besides the problem with the height, you are going to have problems with the floor flexing and the tiles breaking. You might want to reconsider what you are using. Carpet is the best surface there is for these as it allows the rollers no resistance and nothing scratched or broken and one reason why you see that used almost exclusively under slideouts. Most slide out hardware has no height adjustment on the incoming edge and even if you do you change the distance on the top and the wiper seals may not seal and you would have to find longer ones that work. Expensive and time consuming. Sorry that isn't the best news you hoped to hear, but as a shop owner and someone that has been at this many years and 7 years on this site, I can tell you I am familiar with this issue. Please get back to me if you need more as all follow ups are included in our fee.
Just checking back to see if you were able to resolve this issue with the material I provided or do you still need some additional input from me here?