The only cheap fix for a rough ride on the F-53 chassis is to have the coach weighed on all four "corner" and to set the tire pressures accordingly.
You can improve ride with Kelderman or Liquid-Spring kits, but they aren't cheap.
There are fixes for wandering, vague steering, sway, rear-end "push" by passing trucks and for excessive bouncing after going over bumps, most costing money, but some free.
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport