My garage door is 82 -1/4 inches high. My 2006 2720SL fits with 3" - 4" to spare. I have a low profile air conditioner and the factory lift kit.
If you have 80-3/4 inches, you might want to do the same fit check that you did with your boat. However, note that most garage doors can be raised farther than their installed height - the real limit is the height of the beam/header above the door.
To raise it higher, you can
a) pull the dangling cord that disconnects the door from the lift mechanism, and prop the door farther open with a length of 2X4, or
b) most garage door openers have an adjustment (a knob or screwdriver slot on the case) to open the door further.
Bill
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