[Tannaton]

It depends on many factors, there are several situations when a trailer can snake but in some of them you can recover normality by applying power - but just enough to go back to a situation where the car is pulling the trailer and not the trailer pushing the car - you don't want to be doing this down a long hill!

If you brake in these situations you will make it worse unless you brake hard enough to trigger the overrun brakes on the trailer - not something you want to do on the motorway.

It's difficult to describe, it's one area where there is no substitute for experience. The first time you get even a mild snake will be very scary.

Prevention is better than cure, as has been side keep the polar moment of inertia low (I.e. Weight over the axle not at each end) and aim for the maximum nose weight.

Another very big factor is the correct tow ball height for multi axle trailers - raise the tow ball to get a decent nose weight. Zero nose weight or less is bad.