Just outside of Atlanta on 85 South there is what I would describe as a washboard section of road. ( I guess this is the correct term.) What I mean is the road has equally spaced expansion joints that cause your vehicle to setup a rhythm or bounce.) It was bad enough that my dog got sick.
I decided this was probably due to the lightweight of the trailer and the overload springs coming in to play. To correct this I pulled out the weight distribution bars and put them on. The bottom of my hitch on an unloaded truck is about 16.5 inches from the ground. When I set the trailer on it was 14.0. I then used the W/D bars to get it back to 15.5. On the ride home it was much more comfortable but not great either.
Tomorrow I am going to look at the trailer tong and see if there is an adjustment to make it hold the ball better. (The ball on my truck looks like the weight is on the top and front the grease on the back of the ball looks untouched.)