I would STRONGLY advise against top mounting something like this unless you have a good wide "backing plate" under the skin (too much leak potential).
A better place would be on the rear bumper or get an adapter made for the Reese receiver for when your "toad" is not hooked up, yes you will have to carry a few more mast sections, but better that than a roof leak from wind working the seal loose.
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DE: John W9WLS
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