Congrats on your GT 328Tsf. I love mine!
I have read in many of these forums where stuff was left loose at the factory.
Not sure how mechanical but I would find a drive place, run the jacks down and take a look underneath. I recently read where someone was missing bolts on their axle.
this is a red flag safety concern. If you have warranty, call the dealer!
Otherwise, Happy Camping!
PS. Post pictures of your new rig!