As a matter of fact, we already smoked a set of jumper cables. Didn't ruin them, but they sure got warm when we jury-rigged a string of boat batteries to turn the forklift around on the driveway and get it part-way into the garage.
I too have read about the hazards of loose connections. You've no doubt also seen the current "lead" story on evconvert.com
Here's a question: can you go too thick with cabling, etc? Is too much of a good thing a bad thing in that regard?