Add me and my 2LT/RS to the growing list. It's a 2010, picked it up 3 weeks ago and noticed the problem right away going over a speed bump after picking it up.
Had less than 2800 miles on it when I got it.
Description of the noise is nearly verbatim of what i read in this thread so far.
"I'm your huckleberry"
United States Army Air Cavalry
ABM, 2LT/RS, #1848 of 3903 and 1 of 29.
CAI, Gen5DIY DRL LED's, Gen5DIY DRL Harness, 35% Tint