When parking a car with a **light trailer** on a slope, it is important to ensure that the vehicle does not move. To achieve this, you have two safe options:

1. **Use wheel chocks**: Wheel chocks are wedges placed between the vehicle's wheels and the road. This prevents the vehicle from moving. It is important to use appropriate chocks and not improvise with stones or other objects.

2. **Rest the steering wheels against the curb**: This involves turning the front wheels towards the curb. If you are parked on an uphill slope, the wheels should be turned towards the center of the road. If it is a downhill slope, the wheels should be turned outwards, towards the curb. This technique helps stop the vehicle in case the handbrake fails.

These measures are essential to ensure safety and prevent the vehicle from accidentally moving on a slope.