[hofman_dzn]

The problem is the rear end is too stiffly sprung because its designed to have weight in the bed or on the hitch while towing. If you want to reduce the bounce, throw a couple of sand bags in the back or pull a leaf out of the rear springs. TRD or No Trd, no difference, the rear end is barely off the stops with no weight in the bed, so the small ripples in the road transfer directly to the cab. I have the same problem on the 405 from Torrance to Irvine.