I always run airbags on the front axle (to raise and lower it on the fly), and a custom flip bumper set-up (the bumper has two air cylinders that that can raise and lower it on the fly)!!! Here are picture of my Peterbilt tractor (I have since sold it) with the same set up in action!!!!

Cool and Low for on the road!!!!

High and out the way for Off the road!!!

In action in the landfill!!!!