So far the horns have only been for mischief I do think they'll come in handy when I'm towing down the road.Very Nice install and video again Epic!
I have a similar setup on mine but no horns...yet.. I ran my aux air line into the bed, on the back driver side with the same type connector but I used brass, I do how ever like your idea under the truck. My on board air is hooked to my air bags and the aux, but I still have a port unused for horns down the road.
Wolo makes some different sounding horns. Their website has a preview feature where you can compare the horns. They have a bit more of a classical train sound.where did you order your kit from and how much was it? I was looking into getting a ship or fog horn but everything is train horns.