PRG Products specializes in suspension for nissan trucks and suv\'s.
I had a leveling kit in my titan, it was very well made, great directions. I never had an issue but they have a great customer service record from word on the street.
I did end up removing it because when I started towing, it sagged too much in the rear. Great resale value while were on the subject :-D
http://www.prgproducts.com/
