Floor Cracks, Door Cracks & more Cracks

[JMR]

Has anyone ever seen this type of damage before? I have three cracks in my floor that run across the trailer. One by the front door, one in the middle of the trailer and one near the bathroom entrance. The one by the front door seems to be following the joint where the two pieces of plywood are meeting. It appears that there is no support (outrigger) under the joint. I am assuming (hoping with my fingers crossed) that this could be the cause of the problem. I have a sneaking suspicion on what the true problem might be (bent or broken outrigger) but am hoping otherwise. To add to my problems the lower corners of my door frame have split. Has anyone come across this type of problem? If so how did you go about fixing it? (See attached photos if I've done it right)

Thanks
Jeff