I am really liking this trailer!
It would be really great if it had folding hard panels like a Aliner. It would be great in bear country.
I think one could be built. Here's a concept view, some engineering still would need to be done, but it could work like this. In the first view, two solid sides and a solid end:
In this next view, I've omitted the end panel to show how the side panels would fold up:
And in this final view, you can see one of the side panels folded up against the inside of the cover, and then the end panel would fold forward from the bottom, also up against the cover.
That's just a rough idea, but I don't see why it couldn't be built.
Or maybe instead of all that "transformer stuff", a hard sided camper top that doesn't fold using the same basic TrailTop parts...