I have mine on the passenger side of the bed up near the front about a foot behind the cab on the bottom where I can safely access them on the side of the road and not have to get under the back of the TC. Make sure you route the air lines in a manner that they are protected from debris thrown from the tire and from tire chunks should you blow a tire as with the combination of a flat and loss of airbag support at the same time it gets a bit tricky to keep the rubber side of the truck down( I speak from experience). I ran the air lines inside the frame channel after that on the rebuild
I use a bike pump with a gauge to fill them.