After 2 months our caravan dealer, who had the caravan for two months, gave us a phone call to say that they had discovered the problem.
We called in to speak to them and were told that they had checked out for loose bolts throughout and checked out the wheels and pressures.
It took them quite awhile before they found a weigh bridge that would carry out a weight check on the caravan. The only one near was a scrap yard.
This showed that the van was over weight. At first it took some time to sink in as I always tried not to overload the caravans. We only had in the van the same items as we had carried in our previous vans, but with it being bigger and heavier we did not realise the difference in the pay load.
We removed most of the items ie.awning, water containers. Any food and clothes etc.
They then did a test tow for us and informed us that they were happy with it and we could pick it up. At home we check weighed each item and was surprised how the weight added up.
The pay load that the van can carry is only 157kg and we had a mover fitted that is 35kg which only leaves 122kg.
With this in mind we prepared the caravan for a trip away carrying the minimum in the van.
I bought a Reich Portable caravan weight control and used it to check the nose weight and the weight of each wheel. The total weight was 30 kg less than max.with a nose weight of 95kg with 2 full light weight gas bottles fitted. The heavier nose weight was suggested by several on forums, as I normally set at 75kg. We travelled down to Salisbury, Dartmouth, Devizes and back home in Cheshire around 660 miles on all types of roads from motorways to a single track road with no trouble..
I hope this can be a warning to other caravans and motor homes that Weight and distribution does matter.
Thanks to every one that gave comments on the forums and the CAMPING AND CARAVAN CLUB.
I drove up to Coventry last weekend (without the caravan) and commented at how unstable the Unicorns and Pegasus caravans we passed looked. I don't think we saw one that looked stable, regardless of the vehicle towing them.
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I would agree that the nose weight of 75kg is too light for a van of 1600kg. should be nearer 90-100kg. Also is the towball at the right height?
If it was me I would move some of the load to the front of the van as it sounds like the tale end is moving about.
If the van was loaded the same way when the dealers towed it then it isn't surprising they had the same result.
Obviously your empirical figure is better researched than Bailey's. My van with a max weight of 1220kg has a noseweight of 58kg and tows like a dream. Scale that up to 1600kg and you're looking at a noseweight of about 75kg.