I guess you are right, but I am still not clear in the responses received, good as they are (I have stolen some of them and put them in memos to fellow pilots, hope that is OK?).
A last try to elucidate my query:
If I was to go out to the DC8 on the tarmac and put a couple of giant hydraulic jacks, one under the tip of each wing, and lift the airplane, full of fuel and passsengers, completely off the ground; would that put a load on the wings that exceeds the normal g loading/structural limitations?