Thanks I looked. Mine is velcro'd on. I removed the door and see that there is plywood
directly under the pan. There is also 2x2 blocks holding everything up so the pan will not sag. Well there needs to be many more 2x2 blocks installed. When I get a chance I will cut and install more for support.
This group of owners has been a life saver when caring for our Dutchman trailers. Thank you all.