Load the trailer

Hello, have a Jumbo trailer at home. It is entered with 12t total weight, axle load front and rear 6.5t so far it stands in appearance. But now we drive from and to our wheel loader with it. It fits in weightwise, only unfortunately the axle load has exceeded back. Have measured 7.6t. The load is not possible to distribute differently. The axle loads are entered with 6.5t. According to the type plate on the axles it is 8t axles. (Sauer type WRZ 8130). Demand from the manufacturer brought kei n result. There are no more documents available, they could or do not want to provide information. Does someone know about the load? Is that possible, I would already be able to get the axle load raised to 8t.. Tyres fit, axles according to the type sign also. Would you like to hear your opinion.