I inadvertently overloaded a 1000 kg MTPLM Trigano pop top to near 1250 kg. The tyres were rated at slightly above 1250 kg as before I bought it home I’d had uprated tyres fitted, but that wasn’t because of an intention to overload it. In mitigation all I can say is that the public weighbridge in Brecon confirmed that my careful weighing of the payload was within 10 kgs or thereabouts. It towed well, no bouncing around.From a practical standpoint the axle will not fail at 1Kg over its rating - 10% would at my guess be a reasonable overrating. An uprated van will usually take you to or close to the axle limit - as is the case with my Unicorn S4 Seville and it would be unsafe to do that if the axle failed within a few Kg of that figure.
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