If you have a Ford F53 chassis, you may consider doing the "Cheap Handling Fix" before you spend money doing anything else. The CHF re-positions the torsion bar links on the chassis to improve the side to side rolling.
ALSO - inspect your rear torsion bar mounts (Where the mount the the rear axle) these have a nasty habit of bolts loosening , falling off, and breaking the mounts on the axle.
2001 Coachmen Mirada (Ford F53 6.8L V10) - Toad 2001 Civic
It won't do MACH 2, but I can get a sandwich and take a pee.