Mr bclemens should be able to let you know if and where the mounting bracing is inside the wall. I’m betting they’re all built the same whether they’re optioned with or without a ladder, and what make model ladder they use at the factory.
Ken and Terry
2018 Sunseeker 2430S-CD
and if we ever need it, can be pushed by our 2017 GMC Terrain toad (4 wheels down)
Former Georgetown 330TS owner for 10 years with more mods than I can count.