Thanks for bringing this up again, Airperson. Yes, this is a known and very important issue. One of our members actually had a fire
because of this. My Safari has both breakaway switch and trailer jack wires under the edge of the tank cover but my Safari came with a 1" length of pipe under the tank cover wingnut to hold the cover up off these wires.
A friend bought an Airstream from a multi-brand franchised Airstream dealer. The salesperson didn't have enough time on just Airstreams and actually asked "What is this?" as he took out the spacer in front of my friend at delivery. I pointed out the pinch on the jack wire and we got a spacer put back in there right away!
I've found drilling a hole through a small piece of wood gives a more stable tank cover than using a piece of metal pipe for this spacer. Will get some pictures posted...