Bruce,
Here's some dimensions. Sketchup is great for visualizing, it just does not like curves too well, there is no way (that I know of) to adjust them. CorelDRAW is great for one-dimension drawing, and has the benefit of creating fixed pivot points (another Sketchup shortfall).
I would like 18" under the bed, 16" minimum. I welcome others trying to make this work, I'm sure it can be done in some form. I was aiming for a classic teardrop shape, but something different is fine, too.
"I keep thinking that the key is in getting the rear wall hinge point high enough to allow the sides to fold under without problem."
The problem with raising the lower rear (fixed) wall is that it shortens the lid, which moves the wall placement back or requires more overhang on that angled bit. The angle and hinge point seem optimum for headroom, but the profile can be adjusted to be less "tearey" to make the sidewalls work.
"And you want to keep the width at 72" or less, right?"
Yes. It would be space-saving to turn the bed sideways, but that makes it too wide. Also requires one person to climb over another to get in/out of bed.
Thanks for the CAD link, I will look into it.
Miriam,
I won't give up on the overall design, maybe just some details...
"Is there a reason you can't use the front under the bed for storage and make the back lower so the folding doors don't hit it? Maybe raise the sides a bit too. Or even make it longer."
The back can be lower: I've had it like the Kampmaser, all the way to the floor, but there are compromises on other points doing that. Also, I would like to keep the overall length to 12', a common max for USFS hairpin-laden roads around here. I should point out also that I am aiming for 15" wheels, to maximize clearance. This is not intended to be an "off-road" trailer, but certainly a rough-road one.
"Or you could make it where you can travel with it up if wet if needed."
That's a good thought! It should be towable in the raised position, as long as the latches are tight...
Came across Scott W's Rolling Stone, a profile that could be adapted...
And here is a quick workup of it, details not dealt with:
