08 R3T suspension recommendations

 
Suspension bottoming out causing spine jarring hits usually means the preload is too little. The shock travel is 4.13 inches. When you and the spouse sit on it does it take up about 3 inches? If so that leaves 1 inch before spinal detonation on a moderate bump. If you jack the preload all the way up to max stiff and you get only 1 extra inch of spring travel you need a new set of shocks. With you and your spouse onboard there should be at least 3.5 inches of shock travel available to absorb hits from the road.