> So, is there agreement that the back hatch hinge supports cannot take 100
> lbs of hanging weight?  Should be very little wind pressure.
> Thanks for any advice.
>

Jim.... all we have in opinions; no scientific studies...

but it is clear that the rear hatch was not designed to carry 100 lbs
and the 100 lbs weight will translate into much greater pressure/stress as
the van hits bumps and bounces...
My guess... the hinges and latch may take the weight...
the question is for how long....
I don't think the hinges will break and the hatch fall off... but they could
wear and the latch could begin to malfunction

I think if I were going to carry that amount of weight back there I would
install a trailer hitch with receiver and use a bike rack that was designed
to handle that kind of weight.

just an opinion...

Bill