The laws and regulations say what they say.
If you use the actual tax method, you can deduct all the general sales tax you paid during the year for everything you bought (assuming you kept track.) General sales tax is the sales tax you pay on most ordinary items like clothing, furniture and so on, and does not include special taxes on things like gasoline and cigarettes or liquor.
If you use the tax table method, the IRS assigns a deduction amount based on your income and the tax rate where you live. You are allowed to add to this method, sales tax you paid for a motor vehicle, aircraft, or to buy your home or materials to build or renovate your home.
Motor vehicle includes a motorized camper (motorhome) but not a camper trailer. That's just how it works.
