not sure how much it will help on a smaller trailer like the OP has, but the item that made the biggest improvement in TV ride with our 34ft TT was an air safe air hitch. It does a great job of isolating trailer and truck movement. We can watch the trailer move up and down on frost heaves an hardly feel it in the TV.
Now that said. the hitch is expensive and heavy. So unless you travel a great deal it probably isn't worth it. For us it's been great. They now have a class III air hitch for smaller trailers which looks lighter and likely is less expensive. Mine is a class VI.
And the Air safe air hitch is compatible with most WD and sway control systems. We use the Reese dual cam system with ours.