Passport UL Exp 199ML - Mods Questions

[LFord]

Looking for advice from Passport UL Express owners, especially the 199ML owners (2016 and earlier model years).

I took delivery of a "new" 2016 Keystone Ultra Lite Express 199ML earlier this year:

1. The slide-out has a "jack-knife" sofa, not particularly comfortable; I'm thinking about replacing it with a better sofa with armrests, perhaps one that folds out to a bed. [Note: the sofa sits on a bench/shelf-like structure that's part of the slide-out, not down on the floor.]

What weight or other considerations should I be aware of in planning for a modification like that in the slide-out or attaching the replacement to that bench/shelf structure?

2. I'd like to install a back-up/observation camera system on the back of the Passport; the back wall appears to be a non-laminated wall, with the back structure covered by fiberglass "skin," and there appears to be some "give" in that skin.

Where can I find support for anchoring/affixing the camera support plate and obtain 12 VDC power? (I am looking at the area immediately above the center clearance light on the rear wall).

Thanks.