Trailer Restraints Ask An Expert Request a Quote Request Service Or give us a call: 1-888-606-9415 Trailer restraint systems mount on the warehouse exterior and engage the trailer’s rear impact guard (RIG) to prevent unwanted trailer departure and motion during loading and unloading operations. They are often called truck restraints or vehicle restraints. Trailer creep and premature trailer departure can cause serious injury and expensive property damage. A good loading dock trailer restraint virtually eliminates these risks, increasing worker safety and improving dock operations. Additionally, vehicle restraints hold a trailer snugly to the dock and ensure a tight fit with the dock seal, helping to close gaps, minimize inventory shrinkage and reduce air conditioning energy loss.