04 Armada Suspension question
 

I posted this question but since it was my first post it posted it in the new members area, since this is a much more traffic area I'm posting it here too. here is my problem, its with our 04 Armada, the ride is rough if you are a passenger specially in the third row back, the ride on the highway is just bumpy and rough. I searched on line trying to find if they make any air bag suspension kits for the Armada but can't seem to find anything, I also went to Nissan and ask if they changed anything in the suspension between the 04 and the 06 model and his answer was no, everything is the same.
so does anyone else have that problem? maybe replacing the nissan shocks or springs with anything aftermarket will improve the ride! any info would be appreciated.
thanks.