Not to answer for hmdagal, but I think "used for vacation rental" is being interpreted different than the context she meant it in.
In the case where I buy a vacation home, that will be rented out during the time I'm not staying in it then it would be a reportable loan.
If I buy a campground park, with 25 MHs or cabins if you will, these would be considered transient housing and not reportable.
In the above case, if they take a lien on the MH that the owner resides in it would be reportable, otherwise I agree this is a non-reportable loan.
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The opinions expressed are mine and they are not to be taken as legal advice.