I bought a 2010 Four Wind Freedom Elite 21 class C a few months back and did some upgrades on it. I added a Roadmaster steering stabilizer, switch out the factory front and rear anti-sway bars also from Roadmaster. Added a rear track bar from Henderson SS. And it was money well spent. The RV drove much better. Now I'm wanting to switch out the factory shocks to bilstien. Should I? The RV is only a few months old. And how much am I looking at to pay for labor only. Thanks