Agree here with pretty much all ideas as posted .The durango 4x4 is fine and its not that small ,has plenty of mass to it so the trailer doesn't controll it.The proper hitch as all have stated and WD CORRECTLY setup and loaded
should eliminate any sway or somthings definatley wrong .The truck trailer thing does give a pull due to the airpressure between the passing of the semi from behind,and it may just feel like a tugging on your tv and airstream .I have a 60 tradewind ,single axle leaf springs and never any sway.The statement about the torsion axle being better due to what? I know the design and function of the torsion ,cannot see it affecting sway .The roundness of airstreams in windy conditions is a proven design in itself to controll being pushed around .This torsion business is really hyped up more than it needs to be .They are independent in wheel movement and smooth
and I agree that independent suspension on most vehicals is better than not
but they are not magic axles and have there own issues ,namely worn out ,cannot be repaired ,must be replaced .My hadco 5200# trdwnd axle
going strong and they don't break .