I added a couple of inches as a safety factor. I would still get out a eyeball if I ran into a situation that was close. Cant remember where it was but last year we at an old covered bridge. They had a posted height that was 2 inches shorter than actual. When added to my safety factor we had plenty of room. If not it would have been a 20 mile detour. My destination was 100 yards on the other side of the bridge. Thats the only close situation I've ever run into. All others have been way low or plenty of clearance.
A long time ago when we stayed overnite in a motel in N. California and when we were getting in the car to leave I looked up and saw a U-haul truck try to drive under the overhead covering the Motel front door. Made a tremendous noise but not too much damage. Good thing we were leaving cause it attracted a lot of attention.
Our FW 24F specs say 11'2" with AC. I immediately make the assumption it's actually another 6" higher. Then what Gritz said about new asphalt and such. So if I see anything less than 12' I find another route. If that is a route you really want to take I say measure and add in some breathing room. One bump and you're done.
__________________ Jeff and Melissa - Roodie and Jaxson US Navy Vet - Good Sam Life Member 804274173
2019 Hurricane 29M
2015 Ford Explorer XLT Toad
First: Keep in mind the Rail Roads are not required to mark heights
Second: if the road has been repaved the height marked may be less
Third: usually the clearance is not the same under the complete width
Fourth: The listed height is as it rolled of the assembly line, any thing added to the top is not included.
If it doesn't feel right don't do it.
Perhaps if they'd put longer hoses at the pumps: we could just drag them out, and fill up at a safe distance...
Yeah, like on the Air Force refueling trucks. Just reel out the hose, twist it onto the RV, lock it down and hit the switch. The ground line? Fugitaboutit. Ok, the idea needs a little work. But length, yeah.
That almost doesn't seem fair... 
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