I don't know what the 2518 weighs (loaded), but it is my guess that you are right - 13 inch tires are pretty small for any TM. It ought to be pretty easy to move to 14-inch tires - I'm not sure about going all the way to 15-inchers.
In either case, the lift that you plan to add would get the body high enough so that the top of tire would not hit the underside of the wheel well. However, you will need to pay close attention to the width of the new tires. Will they fit, without scraping against either the wheel well cover (on the outside) or the frame (on the inside)?
Bill
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