Our unit didn't come with a ladder. I was in the same boat as you, so I called FR customer service. It seems, at least in my model's case, they put the ladder backing in every unit because at time of initial build, they don't know if there will be a ladder install later on. They sent me a copy of the internal bracing schematic for the rear wall.
Check with FR and see what they can tell you.
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Mark, Vicki, & Scout THE dog
2015 Hemisphere 282RK
2016 GMC 3500HD Duramax dually
1992 Goldwing Aspencade
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