Well by the first picture the shocks have definitely been moved. In your second picture you can see the crack jumping across the old mounting hole. Cracks typically do not jump across holes so I would bet that the cracks were there at the old mount location and the installer moved the mounts to try to stop the issue and then the cracks spread.
Is the MH fairly new to you? Could the mounts been moved by the previous owner because of the cracks?
What I do find a bit concerning is that nobody called you and said there are cracks in your frame and here are the options we can come up with to fix it.
