GiraffeG4 Truck Protection System Overhead Height Sensor GiraffeG4 MSRP: Now: $249.95 - $269.95 Was: Giraffe G4 Truck Protection System - Overhead Height Sensor (Standard Mirror Mount Shown In Picture) Protects your tractor trailer or RV from hitting an overhead obstacle! Sensor measures overhead... MSRP: Now: $249.95 - $269.95 Was: