The A/C is the tallest fixed item on the roof, and the Dometic A/C is ~13" tall. Your 23IKSS lists to be 9'-7" tall, which is from grade to deck, so your height overall will be about 10'-8". HOWEVER, if you leave the radio antenna straight up, you'll snag your cable drop. The antenna, if you don't already know, is adjustable and you can tilt it over to be the same height of the A/C.
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