From the submitter:
"Well, I have car music again. It doesn't sound great, and I have to manually apply +5VDC to turn on the amp, then disconnect another cable to turn it back off... but it works for now."
futon frame bent in the middle so instead of fixing it, he utilized the handy AC Delco floor jack!
The four pieces of tape were all necessary too.
Two bottle jacks, two scissor jacks, a Twilight book and 2x4" oughta do it! Left in a municipal lot, on a slope.
"Need a lift, buddy?"
"Yeah, in more ways than one!"
I'm jacked up on knowledge, brah!