Tyre age limit

It’s not a rule so is unlikely to appear in insurance terms.

It’s generally reckoned that tyres should be replaced when they’re between 5 and 7 years old because the sidewalls deteriorate. 

There are no rules as such. Tyres should be inspected regularly. I change my caravan tyres after 7 years usage regardless - but that is a personal choice.  

Here you go, Phil -

https://www.caravanclub.co.uk/advice-and-training/taking-care-of-your-outfit/caravan-tyres-and-wheels/

 

Perhaps we were unlucky, but we only ever got to 5 years, before cracks  in the sidewalls necessitated a tyre change.

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Suspect it's rare to wear out a tyre on a caravan but they do deteriorate over time due to ultra violet light on them. This is why you can sometimes see caravan tyres being covered over when not in use. Furthermore, if the caravan isn't used over the winter there may be constant pressure on one part of the sidewall causing possible premature failure which I why I use axle stands from Dec to Feb. Change the tyres if in doubt. 

Suspect it's rare to wear out a tyre on a caravan

In 7 years my caravan will do around 25,000 miles and so the tread will be nowhere near low. A good few years ago I realised that the rear tyres on the tow car where over 9 years old from car purchase and so I changed them. No cracks and after I suppose 55,000 miles tread OK as all that rear tyres and caravan tyres tend to do is to roll. Car is normally in FWD and it is front tyres taking most of the strain of cornering and he majority of braking.

The only legal restriction on tyre age is in Germany, where the tyres must be no more than 6 years old in oder to be able to tow at 100km/h. If they are older, one is limited to 80km/h.

Does that apply to the tow car tyres or solely the trailer tyres Lutz

As said there are no rules as such but your tyres must be in a serviceable and legal condition.  Their condition should be checked as part of the service.  The code on the tyre (3615 means tyre made in 36th week of 2015). gives you the age so you can easily monitor and check the tyre.  I suspect most of us check caravan tyres fairly regularly as we do our car tyres.