Why should you use wheel chocks when parking a trailer without spring brakes?

Wheel chocks should be used when parking a trailer without spring brakes to prevent accidental movement caused by gravity or external forces. They provide a critical safety measure, ensuring the trailer remains stationary, especially on sloped surfaces. Additionally, using wheel chocks helps protect both the trailer and the vehicle it is attached to from potential damage or accidents. Overall, they are a simple yet effective tool for enhancing safety during parking.