Loosen the nut then re-install and go to a nearby shopping mall or other large (nearly empty) parking area. Loosen the nut 1 turn and put the split pin back in. Drive in a circle with the loose nut to the inside. Check to see if it is loose yet. Do it again, if necessary.
Once loose, jack up that corner and remove the drum. Spriz with good penetrating oil and replace. Replace nut but only tighten to about 1/4 normal torque.
Do other side and drive slowly home.

Yeah, you will be driving on "loose" wheels for a bit. Honestly, I've driven on alarmingly loose drums at freeway speeds for several miles with no ill effect. Just don't do it for long or regularly! Yes, it is a BIG safety issue.

You could also do this in the street in front of your house but it is much less embarrassing in a place where you are somewhat anonymous... Of course it doesn't bother ME! Uh, uh. No way.

lol

Mike!

p.s. I have also done the free safety inspection gig. Then I take the list home and do it myself!

Mike! (again, still and forever)