I bought a new car a few months ago that is considerably harder to park than my old one was. This is especially true when pulling it in our garage. I thought about hanging a tennis ball from the ceiling to help let me know when to stop, but I picked the Camco AccuPark Parking Mat instead. It attaches to the floor via adhesive, and you simply stop drive when you fill the "bump". It's inexpensive, and it keeps a low profile.

Get it on Amazon for $14.19