alright so i want to get a train horn but i dont want to mount the tank and motor on my bed so i was thinkin i could mount it on the inside on a tool box and drill holes in the bottom to run the lines and wires..so now its all hidden..what do yall think?

 

Sounds like fun.

 

why not just mount the compressor under the hood and the tank under the truck along the frame rails? that's probably the most common, easiest way to do it.