This is the valve extension hose that I will be using on the air bag spring.
Stainless Steel Spare Tire Inflator - Wheel Masters 82286-S - Tire Accessories - Camping World
Doing some rough estimating with some Foamular sheets, it looks like to bring the top, bottom, and sides to a concluding point, it will take about 4' more from the back of Dark Aero. That would make the end point about 11' from the back of the truck.