Wow thank you, you guys are amazing!
Me, discouraged? Never.

No, I'm not letting go of this idea. I'm like a dog with a bone when it comes to projects and I've been dreaming about this one for 20 years.

Don't worry about hurting my feelings. I'm taking every bit of your sage suggestions very seriously because I know you've "been there/done that". I'm very willing to learn and you have no idea how much I appreciate everything you're throwing at me.
We've had regular commercial trailers (24' and 40' currently rotting on our property) and we lived in the 40' camper for a few years so we're familiar with RV's. Husband wants to strip the 24' down to the frame and build up again but I'm like...um, no. Maybe some other time we'll do that and make either a cathedral or a castle and head out to Pennsic, but not now.
I told him that we don't need another RV! We just need a hard sided tent that's already pitched, somewhere to store the stuff when we're not using it and to keep it simple. He started going on about adding lights to the inside and a water tank with a pump and I'm like OMG! No, no, no, no, no! (He likes to over complicate stuff and it's hard to rein him in sometimes). >:[
We thought about the top half going up and down, but that makes it wider than the trailer and it takes 2 people. I have to be able to work this by myself if I ever had to for some reason. Not that I couldn't get someone at the event to help me, I just like the idea that if it ever came to it, I could do this myself. The corbels can't be removable since they're structurally integral to the interior (like in a vardo or sheep wagon).
Water tight. Got it. Will do.
So, back to the slanted roof idea. You have no idea how glad I am to hear that most of you think it will work. Yes, it will be slanted at the point where it's almost the same height as the back of the Bronco. We're figuring in a wind deflector on the flat part that can be later used as a privacy wall around the kitchen box (a useful prop). A friend of ours, who is retired from Boeing and flew a small private plane for a few years, will be visiting tomorrow and we'll bounce some of these ideas off him.
The only reason husband is fighting me on the slanted roof idea is because he doesn't like the way it looks. Ugh.

I don't want it to fold. "The more that something does, the more that can go wrong."
You have to be warped to weave.