So i've decided that my struts/springs are fine, after kneeling on each corner of the bumper they only bounce 1 time, that is to return to their resting position with very minimal afterbounce. So i am going to set up a rear air system. However.... after finding all these kits in the 60-80$ range something hit me... what airs up these springs? Can i simply install an air chuck and use an air pump to do this? Do they hold air? Thanks!