2000KG - 50mm Round Axle. Suits big box trailers for towing bob cats..
Suit 2 tonne bearings, parallel or SL bearings.
OK, if you are overweight on these girls then you are likely to be breaking a lot of bearings and even 2 tonne hubs.
Best call me and try top quality bearings and top quality drums, hubs or discs. Next best thing you can if that 50mm Round is still bending is to throw it away and get a 3 tonne axle setup.