Sway = not enoughball weight, opr possibly gross mass of trailer and load is uot of proportion to the tow-car weight.
A good rule of thumb is that the weight of the vehicle doing the towing ought to be about half the comined weight of tow vehicle, trailer and trailer load.
I tow with a 5.4 litre Ford V8 utility - 550 Nm of torque and1700kg dry weight (the vehicle type is really only seen in Oz) - a bit like a low slung C1500 or F150, and will be upgrading to a Nissan Navara with 3-litre twin turbo diesel (650Nm of torque) next year.
Trailer weighs 700Kg and race car weighs 1000kg and we also carry 70kg of wheels/tyres as well as around a 100Kg of tools and other spares.
I run the tow car on propane with a 140 litre tank in the tub and that gives me 18 litres/100kms when towing, with a 600km range.
I have towed with a 4-litre straight 6 but they really don't have the torque to maintain a reasonable speed and work pretty hard on the hills.
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