We opted to mount our Hornblasters train horns underneath the rear of the truck where the spare tire once resided. A 1/4-inch thick piece of angle-iron was cut down to 37 inches to fit the width of the frame and secured to the frame. Each horn was then bolted onto the bracket for a solid mounting point. Note the horns are pointing towards the front of the cab.
HornBlasters Train Horn Kit Installation - Attention Getter