Reg. Z's rescission rule would not apply if a security interest is not taken in the borrower's primary residence.
Now with that said:
1. Are there any state rescission rules that may apply,
and
2. Is the MH consider real property instead of personal property.
When dealing with MHs it is very important to understand how MHs are treated under state statutes.
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The opinions expressed are mine and they are not to be taken as legal advice.