Cab Suspension issues

[CFR__AND_SONS]

Hi all,

I have a 10 Prostar Limited which I just bought a month ago. I've noticed a few issues with it that I'm addressing one at a time. The shocks in the cab suspension are completely shot. If there is air in the system I can rock my cab by hand up and down from the grab bar in the back. When I hit any dips in the freeway, the cab tops out and bottoms out. Called International and these are one piece airbags and shock and they cost almost $1000 each. Has anybody found a cheaper fix for this? I was thinking of getting some brackets welded to the frame and cab and adding shocks next to the existing piece. My airbags are fine, just the shocks don't work. Any info/experiences would help. Thanks.