I just took a cross country trip in my 2006 xb. The car proformed beautifully except for the rough ride on certain interstate highways. Is there a solution for getting a smoother ride? I have the standard tires that came with the vehicle. Any help would be appreciated.

Yes, there is a solution, replace the shocks, as outlined in the following thread.

http://www.scionlife.com/forums/viewtopic.php?t=65648

Moved to CC.

i have noticed that xb's with aftermarket wheels always ride rough
and have alignment issues