Anti snake devises help, but only if they are properly maintained, I rebuilt my Alco hitch last year as the wear indicators were 3/4, amazing the difference it made, similarly the hitch overun damper, mine lost its oil, when a seal failed on the journey to Scotland, which resulted in very erratic caravan brakeing, £50 and 20 mins work saw a new one installed and predictable brakeing restored.
Paul.
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