Carrier/rack problems of the 2008 Chevrolet Trailblazer

My 2008 Trailblazer has a cracked manifold with 80,000 miles on it.

Had to replace the exhaust manifold due to crack.

I purchased a 2008 Chevrolet Trailblazer in 2011 with 26,839 miles. At the beginning of March 2013 with 33,371 miles, the power window on the passenger side broke and is now stuck halfway down. The door still has power as I can hear the motor trying to work but the window will not move and there is a grinding sound in the door. I could have opened the window more than 20 times since purchase. Also in Aug 2011 at 27,522 miles the stabilitrack sensor malfunctioned and needed to be replaced and in Jan 2012 at 28,547 miles the exhaust manifold cracked and needed to be replaced.