I have a Droptail trailer that I tow my trike on 2 times a year. I tow it about 1600 miles and it has towed very nice. I pull it about 70-75mph with out any problems. This has been for three trips. When returning this year if I got above 60mph the trailer started swaying all over. I looked everything over and thought the suspension did not move up and down much on the trailer. The trike was in the chock the same as always. I drove below 60 all the way back to Florida, at least the gas mileage was better I talked to Droptail and also the company that makes the axle. No ideas from either of them. The manufacturer of the axle gave the address of a dealer near me. I took it to them, they said there was nothing wrong with the trailer.
Any ideas???????