That sounds like an awful lot of odd luck with that van. I don't recall any major issues with our 96 caravan or the 04 T&C. Now the Journey, that... Is another story. The brakes still aren't right.
Maybe the tranny fluid needs changed? Dunno I don't do autos :/
Vibration? I would normally say maybe some snow or ice stuck inside the wheel but I usually don't notice that till around 45mph sooo... I'm not sure.
I'm not really sure about all the other stuff. Sorry
I've always kinda wanted one of those vans to modify. I know that sounds crazy but I want to make one a slammed convertible V8 RWD awesomevan.