elliottblackwood
Adventurer
Yeah.. the geometry is gonna be the butt kicker. Thankfully math isn't my strong point. Haha. I'm sure there will be a lot of trial and error on this. Sadly it may get mothballed for a bit when we move next month. But I'll keep working on ideas if it turns out to be too tough a nut to crack.
Just brainstorming here but I'm envisioning a 2 step solution. You could experiment with heavier duty hatch gas struts for the hatch and incorporate some kind of ratcheting mechanism into the stem of the strut to prevent closure. The 2nd step would be to build a low profile joint that attaches the tire carrier to the back side of the roof rack that allows the hatch to act as a lever when you open it. If you can dream it, you can build it.