OK, thanks all...
As I said in my original post, I am going to measure, and measure hooked up. I thought the given height on the sales brochure would be the highest point on the roof. I bought the 5er new and have not reversed the shackles, flipped the axles or put on larger tires. I also think the 13'6" height is for all interstate highways and if any bridge, underpass, or tunnel is less than that on any road it is supposed to be marked, signed, or flashing lights. Key word there is "supposed".
As a follow up question for anyone that has installed a front A/C, especially TucsonJim, as I looked up the height of the Penguin low profile and it is listed as 9 3/4". After removing the vent and installing the a/c is the 9 3/4 a good number. Just trying to make sure that what the specs for any of the a/c's are close, not advertising a 10 inch height and after installing it, it is 12...