This is my first post in the forums and my truck has a mysterious rattle too.
I can hear it over small bumps and even harsher ones. Its not a constant rattle and sometimes it doesn't do it at all. I cant make out where exactly its coming from but it's definitely the right front/passenger area. Might be something in the door or the dash or suspension ,but everything suspension wise is tight. I thought it might be the plastic cover on the front strut but it shows no sign of wear or damage from rubbing anything. I just installed a HBS 2'' leveling kit last weekend and had the front end realigned and its still there =(
my truck is a 2012 express ,4wd ,hemi ,quad cab,