The advanced Pedestrian Legform Impactor (aPLI) was introduced for the assessment of pedestrian safety, which considers femur injury criteria and represents, in particular, SUV-pedestrian accidents more realistically compared to its predecessor the Flexible Pedestrian Legform Impactor (FlexPLI). However, designing pedestrian friendly SUV front-ends not only involves reducing lower extremity injuries but also pelvis and head injuries. In this study, we investigate the bonnet leading edge (BLE), which is a critical area for all three types of injuries, using a detailed Finite Element Method (FEM) SUV model with sensitivity analyses at the two test positions Y0 and Y+600 (at the vehicle centre and at the right headlight from driver’s perspective). Thereby, we decompose the BLE into its horizontal and vertical stiffness components and show that a horizontally weaker BLE helps to decrease all relevant injury values for both test positions. Further, we show that a vertically stiffer BLE helps to reduce the leg and pelvis injury values at test position Y+600 even for a wide range of shooting heights. However, this subsequently increases the head injury criterion (HIC) value significantly, which gives rise of motivation to actively control the BLE’s vertical stiffness depending on the individual load case (weak vertical stiffness for head impact and stiffer vertical stiffness for leg/pelvis impact).