Semi trailer for iron oxide

We are looking for a specific trailer specifications
SEMI-TRAILER FOR IRON OXIDE PELLETS TRANSPORT

The rear tipping bulk trailers shall comply with the following specifications:
Trailer own mass: approx. 13 ton – to be confirmed by supplier;
Main chassis made of I-shaped longerons and cross members, steel quality S355J2 (St. 52.3) or better;
Three axles (BPW or SAF, 18 ton capacity at 100 km/h each), multi-leaf spring suspension, approx. 1.4m CTC distance between axles;
16 (12+4 spar