Any financing is also a mortgage, tax deductible. We owned a motorhome for awhile, and the interest charge on the loan was considered a mortgage. If I recall correctly, had to have a kitchen & bathroom to qualify. A pop-up trailer, for example, does not.
We financed a 40 ft sailboat many years ago, even though we could afford to pay cash for it, we used it as a write off. We paid it off quicker than we should have and lost the write off but......shrug we still have it. It is my 2nd home.
If it was up to me we’d sell our huge home,that has tripled in price, and the sailboat and buy a huge boat to live on. We could pay cash for it. Just haven’t been able to talk Hubby into it yet. Lol
And yeah we did without in our earlier years and worked our tail off so that once the kid was gone we could do what we wanted and would have the money to pay for it.