Normally, with a misalignment they just have to realign the dish itself and tighten down all of the bolts and such that hold the alignment. Sometimes, especially if you are in a windy area, the dish can get a little out of whack, so to speak, in it's pointing. It's not usually necessary to reinstall the dish at another location, though, of course, this would be up to the installer if it needs to be.
Hopefully your realignment will be a simple procedure and get you back up and running normally in no time.
I just realized my last sentenced sounds like surgery or something. LOL.
I really don't know how much movement it takes to have the dish become misaligned, but it's almost assuredly not much. With a mobile home I can see it happening pretty easily due to adverse weather conditions, or even like you said, just the changes in temperature due to things expanding and contracting.
Is a normal pole installation possible for you or would it not be high enough to clear obstacles? They mounted my original legacy plan dish on a pole they installed, then mounted my Gen4 dish on the same when I upgraded. They did a fantastic job of setting the pole and it has never gone out of alignment in twelve years, even with the wind and snowstorms that we get rolling off of Lake Erie.