As I heard it explained, real estate tax on your first home and charitable taxes would be deductible but second homes, vacation homes, cars, boats, etc. taxes are not now nor will they be if changed.
Second homes have never qualified for the mortgage deduction. I rent mine so I classify it as income. Most years, I take a slight loss so it actually lowers my taxable income.
No, they are eliminating the State Tax & Property Tax (SALT) deductions. Mortgage Interest would stay.
However they are increasing the Standard Deduction for single to $12lK and MFJ to $24K. So you would have to reach $24K of deductions to exceed the Standard Deduction before you start itemizing.
Nope. State and local taxes - both income and property - would no longer be deductible.