You can enter your county tax by following these steps:

1. In TurboTax, open your tax return
2. Click on Federal in the left-hand column, then on Deductions & Credits on top of the screen
3. Scroll down to All Tax breaks, locate the section Your Home and click on Show more
4. Click Start next to Property (Real estate) Taxes.

Please note that lot rent is not deductible.

If you do not own the land under your trailer, but are simply paying lot rent, then you have no taxes to deduct. They belong to the owner of the land, your landlord, and only they get to deduct the tax bill they paid on the land they own.