Scenario #1: reportable only if your institution classifies internally (through color-coding files, separate call class codes, etc.) these types of loans as home improvement.
Scenario #2: I assume you are referring to a power unit attached to a dwelling somehow; if reportable at all, it would fall under the same scenario as #1.
Scenario #3: Unless the camp is on real estate that also contains a dwelling, it doesn't sound like a home improvement loan. If there is a dwelling, it too would fall under the umbrella of only reportable if your institution classifies these non-dwelling secured types as home improvement internally.
I agree with your last statement. A loan of 6 months or less that fully amortizes or is expected to be repaid in full at maturity would not qualify as temporary financing.
(My opinions/interpretations only, but i hope they help.)
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I'm fixin' to fix that.