My bet is that your dealer will take you to the cleaners on the inspection, and not do any better job than they did the first time. They will just suck up that easy money.
I think you've probably worked out a lot of the bugs that all trailers start out with. But if you want a good honest inspection, I would suggest finding a local mobile RV service guy and have him come to you. You should be able to follow him around and ask questions, and learn about the systems. You don't want to pester him too much, but if you get a good one you can learn a ton. At least you will be able to see that he is working instead of sitting around whacking off in your trailer.