The Inflatable Truck Shelters are interlocked with the Loading Dock Doors. Once the Loading Dock Door is opened, the Truck Shelter automatically inflates. Once the Loading Dock Door is closed, the Truck Shelter automatically retracts. The Inflatable Truck Shelter seals on the sides and top of the trailers reducing the potential for rain to run off the trailer top onto the dock. The rain run off would create an unsafe condition for the dock attendants. Over the years this Retailer has experienced the proven reliability and performance they get with Pentalift Loading Dock Equipment.