Suspension Noise problems of the 2007 Nissan Quest

I bought my Nissan Quest 2007 se in may of 2012. . From a dealer. . . After 2 months of owning my vehicle I started to notice that the front suspension would always rattle. . . Or fell like something was hiting. . So I took it back to the dealer and said it was the suspension so he sent me to his mechanic. . . . After about 2 days with out my vehicle. . . They called me to say everything was good . . . It did the same thing a few week later. . . . . At this time I noticed the the steering will was getting stiff so I had it checked the oil and yes it was a little low. . So I added power steering fluid. . . As I was headed to the highway at about 55 mph the steering wheel was so hard to turn to the right off highway lane. . . So I decided to turn back to town. . . . . I headed to the gas station as I pulled up to a pump it sounded like a burst and all the oil started leaking. . . I did have this part changed as the dealer again said they did not fix this problem. . . I had a mechanic change the so call part. . ,, but my minivan has not changed at all the power steering is the same . . . Having difficult steering,,. ,, its almost my 3rd year in may and I have not been able to know what the problem is. . . As I am still paying it off. . . . I had a friend tell me to file a report and as I dont know what else to do . . I did google and I have found other people say they have the some problem. . . Please let me know what else I can do or is this a manufacture problem. . .