Fastway (R) ONESTEP ™ Stabilizing Wheel Chocks Eliminate Unwanted Wheel Movement, Providing Ultimate Stability For Your Trailer. The ONESTEP Positively Locks Both Wheels Securely In Place, Allowing You To Freely Move Around In Your Trailer, With Virtually No Wheel Movement. Whether You Are Cooking Or Getting Up In The Middle Of The Night, You Will Love The Stability The ONESTEP Provides.