For a dd what would be the best way to tune the suspension, spring rate and damping or sway bars?

 

For a daily driver, buy the TRD package, put it on the car, get an alignment, and you're done.

If you're into tweakery, get a set of adjustable coilovers, adjustable swaybar endlinks, front and rear camber kits, and get on some scales.

There really is no in-between. Only compromises.

 

hotchkis has some good swaybars too if you're big into suspension. otherwise the TRD swaybar and progress are ok