Dan,
The best way is o measure your coach. I did not trust going just on the average info that Winnebago provides.
I aired up my suspension and measure to the top of the roof. To that measurement I added the height of the Dish antenna dome, which is my highest structure and made a note of this. This is height plus another 6 inches is all I feel comfortable with for a minimum clearence. You also might consider the radio/CB antennas as these will be damaged if you hit these at speed. My highest device on the roof is my CB antenna, which is spring loaded and will fold flat, but as I said I would not want to try folding it at 60 MPH as I am sure I will no longer have a CB antenna.
Also remember that the height will increase in a short tunnel that has no flat road surface underneath it.
__________________
Harry
2015 Tuscany 40 KQ
2013 Honda CR-V
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