No, there is no a design flaw.
If you take off the outside corner molding where the walls join, and cut out some of the foam sealant, you will find that the panels are framed with aluminum channel, screwed together at the corners - and that is a totally acceptable way of joining body panels. It is not a question of "nothing to screw into". I suggest you do this, replace the screws or insert new ones, then add a little foam, put the molding back on and recaulk.
I'm not at all clear on how or why a TM of this vintage could spring the body panels apart. My guess is that someone backed the trailer hard into a stump, fire hydrant, gas station barrier, or the like. The bumper would take the impact, but just as in a car, the sudden hard jolt could spring body panels apart.
Bill
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