I don't have a Gulf Breeze, but if there is not a place to mount the ladder, I wouldn't drill into the roof. It's very thin wood unless you HAPPEN to drill into one of the bands...even then, there isn't much there.
I would not simply rely on drilling into the fiberglass, either. I would feel more comfortable if you could 'rest' the lower portion of the ladder on something like the rear bumper or somewhere. Then you're not relying on your rear-wall connections in shear, just straight tension. Rather than helicoils, I'd probably figure something up using short lag bolts.
Once you've figured on all that, I don't know that I wouldn't just make my own ladder. There are a variety of ways you could make one with plumbing fittings...sounds ghetto, but you could probably make it look pretty nice with a little effort and a few grinder wheels.
As far as the TV, there are any number of ways to tackle that. Our 'entertainment' area is also the barrier between the living room and bedroom on our 255BH, so I drilled straight through the wall and cross-mounted two TV brackets on both sides of the wall, held together with Grade 8 bolts. I have a 23" LCD on the bedroom side and a 32" LED on the living room side. The bedroom is on a straight mount and the living room is on a swing-arm. A couple hours making a surround to keep it in one place when in transit and I was in business. Even have a DVD player on one side and a BluRay on the other, wired so I can watch the video from either player on either (or both) TVs.
If you're mounting to an exterior wall, you could also mount a "sub-plate" of more solid wood that will handle the stress of a larger TV. Most importantly, you're trying to spred out the moment load over a large area so your bolts don't pull out. Do it out of nice poplar or a birch-laminated plywood and you can make it look really good. Then attach your mount to that. Much better than bolting it directly to your trailer wall.
Hope that helps.
Keith
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