Can you describe this attempt? Sounds interesting .
What kind of rope ,how many meters and what width? Also what about the knots?
Method *
I don't believe in "attempts"...
1cm thick non-stretch (its cheaper, and ensures one quick jerk). I believe rope must be over 0.7cm.
As many meters as you can afford. At least 30m. I'd go with 50m plus
Anchor more important than knots. Large tree preferably.
Anchor knot would be a few loops around tree and passing rope back under itself to lock. Or large schackel/carabiner if worried about interference and want to be quicker.
Knot for the neck side is interesting. Proper slipknot if you can be arsed. Otherwise even a fixed loop should work. I imagine it will function like a cheese wire.
Rope neatly looped on the ground behind the car to ensure it pays out nicely.
Rope through driver side rear window, through the gap between headrest and seat.
Prepare your final joints, pipes, etc. Get in, rope around neck, hit supplies, floor it.
I have ordered SN now, but this way is certainly more badass. A bigger statement. And you get to go out high which is harder on SN etc.