Something i dont think you have looked at yet is the end of travel can be variable. Think uneven ground, kerbs and even parked on a slope.

I have a hydraulic lift in the back of my van that does similar to your requirement moving a small platform from the rear floor out and down to the ground .

You will need to think carefully because the end point at one end (retracted into the boot) is fixed but the other end of the travel is not fixed.

The most likely is flat ground at the same level as the car verses reversed up to a pavement so 150mm or more higher than the surface the wheels are on.

If you have a fixed limit switch this will cause problems as the unit will keep driving even though its hit the deck.

Sorry to add another complication but hope it helps