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Question: if the bank forecloses, does that affect the rest of the land now since it is registered with HUD?
It shouldn't unless the land is somehow rolled into any loan that is on the property. But typically mobile homes are just financed alone, because they have titles, just like cars, and are considered personal property. So if someone didn't pay their car note and the lender sued them to retake possession, the same thing can happen to a mobile home owner.
The only way to know for sure if the mobile home is "bundled" with the real estate
it sits on would be to have a title search done to see if there is a lien on the land from the mobile home.
.I also assume that they can not simply move the mobile off of the property but need to dismantle it to the frame in order to move it now. Is that correct?
Actually, depending on the age of the home, they can and will just remove it. They typically transport mobile homes on axles that are attached to the mobile home and then removed once they reach their destination and the home is placed on a foundation or piers. But the older the home gets, the less likely they are to do this simply because it can destroy the home to try to transport it this way.