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I actually had been looking underneath some trucks a few months back... You're absolutely right, most of the fundamental stuff has all remained the same, though it seems I always do come across some petty differences such as in the routing of wiring or other crap (probably added emissions and/or OBDII crap). As hokey as a hose simply clipped to a frame lip is, I always wondered if Ford would ever try to change it in some way or not . Simple is always better thoughYou know just as well as I do Junkie, that not a whole hell of a lot has changed under these trucks.
Update:It appears that the rear axle vent hose might have been attached to a flanged hollow plastic plug, which is inserted in one of the small holes at the bottom of the bed support.