YOU SAID:

I brought the towel to my car.

INTO JAPANESE

私の車にタオルを持って来た。

BACK INTO ENGLISH

Brought a towel on my car.

INTO JAPANESE

私の車のタオルを持って来た。

BACK INTO ENGLISH

Bring your towel on my car.

INTO JAPANESE

私の車にあなたのタオルを持参します。

BACK INTO ENGLISH

Bring your towel on my car.