The trailer is not bouncing, but the dishes and food are
Thanks for the comments, which are useful. Sorry to be unclear about what is going on with our FF 189 FBS. The trailer is not swaying or bouncing around back there, just the stuff inside, mainly dishes, which we keep in the cabinet next to the microwave/convection oven, and the food, which we keep in the cabinets next to the access door. Our TV is an 08 Frontier with 6' bed. We are conservative about the weight we add to truck and trailer, and never travel with wastewater in the tanks, but we carry a few gallons of fresh (maybe a third of a tank at most). We use a weight-distributing hitch and a friction sway bar. The truck and trailer are even and level from bumper to bumper. The load bars are parallel with the street. There is no sway in the trailer, and the whole rig moves slightly toward the passing large vehicles just before they go by, nothing that alarms us. I've watched the trailer during enough passes to know that it does not move to the side except as the truck is drawn into the wave of air built by the passing vehicle. We feel that the rig is safely set up, but we would still like to give the trailer a smoother ride. Yes, I'll admit it: we have not weighed the rig, but we did almost 8,000 miles of towing this past winter on our way south and back again and during a side excursion from south Texas to southern Arizona. Adding shock absorbers is just an idea to achieve a smoother ride, and is certainly overkill.