Unsolved small problem with bending trailer

so i have a custom trailer with a 70ish ton load but the problem is that it bends like in the picture

I asume i need to edit something in the jbeam to make it stronger but im not sure what?

 

You need to modify the Jbeam in the center make it have more support from the front and back of the vehicle.

 

~70 tons isn't exactly feather weight, so ofcourse it will bend

 

i know that but i like to find the limit.

the problem is i cant get over the hills because the landing gear get stuck on the ground

 

The value you want to increase is called beamSpring. This will make it bend less. However, you may have to increase nodeWeight too if it gets unstable at higher spring values.