Problems - Nissan Patrol 3.0 litre 2002 model

I am enquiring whether owners/drivers of 3.0 litre Nissan patrol have had the same problems I have had and in particular, I enquiring whether there are any other problems I should be made aware of. 1. got the car December 2002, went for a trip to Brisbane and noticed a bad rattle from the rear of the vehicle, sounded like a loose exhaust flange. I took it to a Nissan dealer who told me that the rear number plate was rattling and take it back to where I bought it. When I got home I also noticed the fan belt was making a screaming noise when started similar to a loose fan belt. I rang the service manager where I purchased the vehicle in regards to the fan belt noise and he said he has never heard of the problem. I hung up rang the same number and asked to speak to the workshop mechanic who told me that there was a problem with the automatic belt tensioner and that Nissan have put out a bulletin on the matter and would replace under warranty. I took my vehicle and had the belt tensioner replaced and asked for the oil leak to be checked I noticed in the front of the motor. I was informed that I would have to have the motor or gear box removed to remove the sump to fix an oil seal at the oil pickup. When i enquired about the rattle at the back of my vehicle nothing could be located. I got home feeling pretty wellbleepoff and got under the car and searched for the rattle myself and discovered that the rear nearside (passenger) spring was loose and lost its tension and when I hit it with the palm of my hand... bingo.. that was the noise I had heard since the car was new. I measured the heights of all springs and noticed that both the springs on the nareside were down 15 mm. I returned to the dealer, showed them the lose spring and they said it would be replace one spring under warranty. I informed them that the front lefthand side was also down, however they said only 1 spring would be replaced as this was Nissan's policy, one spring at a time. when I went to pick up the vehicle with the new rear spring fitted they informed me that now they have determined that the front one needs replacing and I would have to bring my car back yet another day! I have jut had the front spring replaced and have my vehicle back again only to have the rattle noise continue from the back of the vehicle and I think it may be the other rear spring. By reading some of the article posted here I am of the opinion maybe the top spring plate may have been bent somehow or another. CAN ANYBODY PLEASE GIVE ME SOME ADVICE OR EXPERIENCES WITH ANY OF THE ABOVE OR OTHER PROBLEMS EXPERIENCED BY THEM. My mate recently bought the same model as me in 2003 and he was informed that the 2003 is the 3.0 litre Series 3 model and all the faults have been fixed. Yet when I rang Nissan customer service in Melbourne they told me there is no Series 3 turbo diesel, only Series 1 and Series 2.
Thanks