How much floor bracing is needed?

[nnnnnate]

I'm building my scratch trailer and got all my sheet fitted today. The tub is 4x6 with two braces from side to side. The sheet I've got is 18 GA and I don't want it to bow like a lot of the m416/m100s that we see so often. What do you guys think? More bracing or leave it be?

 

[rnArmy]

I would also add some front to rear bracing between the cross members. You can simply use some angle iron welded underneath. My tub's aluminum, so I used aluminum angle.