Has anyone done the Latex mod?
"What is this latex mod he speaks of? It sounds intriguing!" you say?
Well. The Superduty bunch has been duing it for years. What we do/did, is run 3/8" OD latex (some prever that clear vynil tubing) through the door weatherstripping. Wind noise is all but eliminated, and the doors close with a positive "Thunk!".
I've been thinking of doing the mod on my Mark as well, even though I don't have any rattles. But the door does sound a bit clanky when you close it. Yes, it's been adjusted.
I wonder if that will help with your guys' rattle ailments.