It looks like door has lost some of its lower curvature, producing a large gap at the bottom. Am I seeing that correctly? Does the top fit reasonably well?
If so, the Dx could be a rotted core, typically due to leaking from the window. You can confirm by drilling small holes at the bottom of the core (on the inside where the thick part ends). Worst case, water will run out. If not, you can probe a bit with an ice pick or stiff wire to assess the condition of the wood material sandwiched between layers of
fiberglass.
It’s a fairly common problem in older Boler-style trailers. The Rx, unfortunately, is to cut out the old core and
fiberglass in a new core. It’s a tricky and messy project, but there are old threads to help.
A short-term solution I’ve seen is to attach a magazine-rack style storage unit to the lower door that forces it back to the original shape.
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