Through sufficient attachment points on the wall, bend even with heavier wheels nothing. The covers on the end of the rails are made of soft rubber - not particularly pretty, but they serve their purpose. The anchor I have directly replaced with what Fischer.
After I had installed two of these holders at the weekend, I ordered two more directly. Now order and space in the garage and it is easy to clean, there is nothing more standing around on the ground :-)
More goes for the price hardly - strong buy recommendation.