The thread is awesome, it has really inspired me to work on my trailer. I have a HF trailer allot like the black trailer but it came with galvanized sides I got it about 4-5 years ago. It needs some work I have to replace the floor I'm thinking about steel or diamond plate and then bed lining it. Just put the jack on the front I'll try to keep things updated.
No; the trailer has a vinyl liner with a vinyl cover. If you go back a page or two in this thread it will tell you more about it. I agree though, it does look like we have a RTT.
Inside the trailer is all our camping gear (minus luggage, sleeping bags, pillows, etc.). The tent is 10x13' so we can have two large Army-type cots inside and have room under our cots to put our luggage. It really works out great. For two big guys (~200 lbs each) I don't think a RTT would really work for us. We're able to get the tent set up and taken down fairly quickly.
I don't have any pics of the hinges but can take some when I get back home and ge the trailer out of storage. I made them with tube and all thread. I can open the lid and slide it off to have an open top trailer as well.
So we got back from Alaska and Canada on Friday. I'm happy to report the trailer did excellent! The trailer tracked for hours on end at 60 - 70 mph, and tolerated hundreds of miles of dirt/gravel roads with no issues. There's no way we could have brought what we wanted on this three-week Alaska/Canada adventure without the trailer.