My experience has always been the exact opposite, i.e. that tolerance dramatically decreases the farther south you go in Germany. The only real problems I face in cities like Hamburg or Bremen is cobble stone streets, whereas in Bavaria there is a lot of staring and whispering rather loudly. Yes, people will usually help very kindly, when you ask, or even offer themselves, but they do that mostly anywhere in Germany. For acceptance by people on the street and official institutions though, you couldn't pay me to move south of Hassia longterm.To reply on this question from the inside: As a German FA, happily married to a BBW, but not supersize, I always find, that it depends a lot on the region, what is happening. In the South of Bavaria people might joke openly about your figure, because people there tend to make jokes about everything, but beyond that, the same people will prove very nice and caring. In Hassia, where I am currently living, people will not care a lot, because privacy is an important value. Going to the North and to the East, people are less tolerant in all questions and in the far Northeast, tolerance is something non-existing. The hometown of my wife is in that corner of Germany and my wife often complained about being nagged. Today she says, she hears more bad remarks in two weeks at home, than in five years here.
Concerning the scooters, I have seen them only a few times in my life. They are rare in Germany, but also in the rest of Europe. And noone would offer them for free use!
But in Europe most things are of smaller size compared with the US