Almost all of my pipework runs along the tops of the chassis rails. It was a pretty tight fit under there too so the cab dropping may have touched something? It could also be that the two are unrelated, which would be a bit frustrating!
The mount is sorted and pretty tidy. It had been welded in the past and my mate reckoned it was totally sealed up at the bottom. He's left just a small gap as a drain hole so water can't collect. Makes sense I guess.
What I do need now is a set of cab mounting bushes. All three ideally. They're a bit perished but still flex. For how long I don't know. The front one is completely shot.