My garage door opening is 82 1/2 inches high. My '02 TM with roof air EXACTLY fits the opening - the top of the air conditioner brushes the rubber weather seal at the top of the door frame. I believe T_C is right - the new models come equipped (at least optionally) with a low-profile A/C, which should buy you an inch or more. My TM has a standard Dometic Brisk-Air 13,500 BTU A/C.
The slope of the driveway shouldn't matter. The high point of the TM (the A/C) is positioned pretty much over the wheels, so no matter how you tilt it, the A/C doesn't get higher or lower.
BTW, my garage door didn't originally open all the way - when it was "fully open", the top edge of the door was lower than the top edge of the door frame, and the TM woldn't fit. Fortunately, most garage door openers (including mine) have an adjustment to set how far it opens. I just set it to open higher, and all was well.
Hope this helps
Bill
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