Looking For Switch

You're not wrong, kinda like saying hornblasters has a great bracket that will replace the spare tire to hold a complete on board air system

 

Ah - nice setup. That will be useful for sure.
Is it the tire delete bracket? Interested in seeing how it looks on yours when you install it.

 

Run an in cab switch that is triggering the coil to a relay. You're asking for a fire if you run 30 amps through the cab. The wiring is very simple if you take your time. Of course you can directly switch your source as you mentioned you would like to, but it would not be recommended by any professional for the sake of you and your vehicles safety.

 

Yes, it is that bracket. I had to modify it a little to get a 5 gallon air tank but I now have a 5 gallon on board air system. It's actually already in and completely wired up, I'm looking for a switch that would actually look good. However, I do not recommend using a 5 gallon air tank since it's a little lopsided because it wasn't designed for more than a 2.5 gallon tank. It doesn't sit much lower if any lower than the spare tire.