We had the IS installed on our Cyclone last month. If it helps, the main rail welded to the bottom of the frame is 3-3/4 inches tall and 2 inches wide. But you might check with Morryde. I remember the Tech mentioning that there is an adjustment at each wheel that they use to level the RV. I think it raises or lowers in 1 inch increments, but not sure on the specifics. Might help with your issue if it can be adjusted at each wheel to raise yours.