Find my parked truck

...I also believe you can tell / ask Siri, "remember where I parked" and "she" will mark it on Apple Maps for you when you get out of your car.

Then, if you need help later, you can say / ask, "give me directions to my car" and "she" will help you get back to your vehicle.

Take a picture of the row you're in before leaving your car or mark the spot in Maps. I believe there are devices you can buy to install that allow you to find a parking spot as well.