Lippert makes these doors for Forest River (and probably everybody else). My toyhauler door was spongy along the hinge line. It looked like the hinges were going to push through. I sent pictures to Lippert. They said it was water damage (one of the side pieces was loose on the door, i.e., not sealed) and replaced the door.
This pic shows where the side piece was moving when the door latch was operated.
Hinges are sinking into door
Hard to see - in the corner the flooor/door covering is bubbling up