If you work with different weight trailers and have ever used good axle to frame bags especially on rough roads you won't even re sell your old Timbren bump stops. You will dispose of them so as not to do the dis service to the next guy.
I know if a guy has a problem and finds a solution it's great until compared to another solution that is much better. I mean somebody still thinks a block of wood under his springs is a great solution and he could be correct to a point. And it's true the block of wood would never have an air leak.
Working with a rather soft coil spring as opposed to a stick & slide leaf spring makes this even more apparent.