It's all about ball weight, not enough weight on your balls , you are screwed.
Too much weight on your balls your screwed again.
Get your ball weight balanced and avoid problems.
73
Jeff
Several years ago I went to Prince Edward Island to pick up a decommissioned RCA BTA-1S one kilowatt AM broadcast transmitter. We laid it down on the trailer after taking the plate and modulation transformers as well as the modulation reactor out. We put them on the back of the trailer and soon realized that was a mistake. Together they weighed about 300 pounds but it was enough to put a negative weight on the hitch. Anything over about 40 mph and the death wobble would start. We stopped and moved them all the way forward to the front and continued the long drive home. 70 mph and not a problem after that. We misjudged the weight distribution on the trailer.