Endricken wrote:
The Lever and Breaker bar analogies are fine if the components are movable, however typically the Adapter/Pinbox/Frame are all "fixed/pinned" solidly, so only forces greater than the strength of any of these would cause rotation. For example, if a lug nut was welded to anything, a torch or saw would be needed to remove it vs. any normal breaker bar.
Nonsense. With enough leverage you can break the weld in your example. I've broke fasteners loose that I didn't realize were tack-welded until afterwards.
If you grab the end of a paper clip and straighten it. The wire bent up because you applied a bending moment that was greater than the elastic strength of the wire. The principle is the same for a trailer. They just have a whole lot more strength to start with.
