This will be the method me and bigun take to our air horns. I got my top of the line Nathan K5LA Airchimes. YouTube - Nathan Airchime K5LA Train Horn! The Air System Used In My Van For My Train Horn.
I will be installing Nathan K5s also, but I will be putting in 12gal tank (or two 6 gal tanks) and 2 compressors. Hope to mount everything under the truck between the frame rails and body, with the horns where the spare is. I will also be using security screws to mount every thing.
Yeah your going all out lol.....I'm going the cheap and simple way. I'm not going run a compressor. I'll just fill the tank and get around 10-12 honks at 10 seconds a piece. That should scare the bejesus out of someone