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Possibly the overrun damper in the coupling is weak due to age/fault/miss fitting.

edit: oops! more or less what wongers said above.

Cheers all - Ange/Kev, yes we use a 1.6 so like you, we are quite close to our limits so that ay well be that.

It may be worth just checking the damper. Especially if the camper wasn't purchased new.

I purchased a caravan where the previous owner had removed his ALKO stabaliser hitch and refitted the standard coupling head, but had failed to make sure the damper was reattached. This resulted in a knock when moving away.

A good damper should allow you to compress the coupling with a fair amout of force, but it should only fully compress over a period of several seconds, and take the same amount of time to return to its original position once released. If the damper is shot, it will compress very quickly and spring back to its original position almost instantly once released.

If the after compressing the coupling, it just slides back and forth clunking then the it probably isn't attached.

pieface

I tried the damper action as suggested and it will go in with some force and then it returns with a slow smooth action. I guess Ange/Kev's suggestion was probably correct.

Thanks to all

CC

Thanks for that Lisaann, I may well do that after the bank hol.