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Given that most touring caravans have only two wheels that are usually easily accessible, it is surprising how many come to a shuddering halt with a blown out tyre. This does not happen nearly as often with our cars, which cover much higher mileages often at higher speeds so it is unlikely to be the tyres that are at fault.
from: http://ezinearticles.com/?Touring-Caravan-Tyre-Pressures-and-Loading-Weights&id=6637619
