Your second loan is dwelling secured therefore it is subject to TRID, 1026.32, 1026.35, 1026.36, 1026.43, Flood, HMDA, etc. In other words the only thing abundance of caution gets you out of are the appraisal requirements in the Interagency Appraisal & Evaluations Guidelines.
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The opinions expressed are mine and they are not to be taken as legal advice.