I happened to be in Chicago when they where moving the U-505 to it's new home, I was just looking at some photos on my PC and thought you might be interested in seeing these pictures if you haven't already.
I remember walking up to the chain link fence and getting bitched at by a very rotund black chicago cop. It was worth it though, you don't see a U-Boat being wheeled around just every day.
There was a temporary road surface laid down for the ramp, but the weight caused the wheels to dig in a fair bit, it all looked very dodgy indeed!
http://www.hydepark.org/parks/jpac/submove2.htm 
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