A knee air bag mounting system is provided that includes an air bag mount for a heavy truck-type vehicle. Such an air bag mount includes a front wall having an air bag aperture therein adapted for passage of an air bag module of the knee air bag system. The air bag mount also includes a first side wall extending away from the front wall, a second side wall extending away from the front wall in opposed-spaced relation to the first side wall, a top wall extending away from the front wall, and a bottom wall extending away from the front wall. A bracket structure is disposed within an interior space of the air bag mount and configured to provide a connection point for the air bag module. Each of the first and second side walls and top and bottom walls are free from direct connection to one another.