I have no experience of the Aero chassis systems at all but I would definitely get that checked over thoroughly by a dealer before you get too brave in it, there shouldn't be rattling noises.
Minimum jack it up and get someone to rock the steering wheel while you hold the wheels in turn and identify the slack whatever it is.
Several Aero guys on here have mentioned worn rose joints in the steering department on here and replacement thereof normally by Simon on here.
Good luck.
