The "lifting helper" gas struts lower supports on my own TM are bolted into the floor with strong segments of angle bar. See this photo:
https://www.trailmanorowners.com/for...5&d=1688756048
It is possible to stabilize and reconnect the floor to wall corner angle by turning my bar upside down. The vertical "outside face" of the bar, insteasd of hanging down, would be installed with that face going up against the side wall exterior.
Mine is too thick to flip upside down, the 1/4" steel and into-the wall bolts (combined) would stick out too far and make a mess of the bag seal during lower of the rear shell. But thinner metal might work OK, you don't need all the strength of my add-on part.