I did not know about alcan, thank you for the info! So for your xterra Terry, you said a custom spring of 3" lift with +500lbs. Is that a 3" lift in the back to compensate for the extra weight or what is it talking about what lift you are compensating in the front? How do you determine what lbs to have the springs rated for? Daryl, I was lucky to get the truck with only 68,000 miles on it, I have 86,000 on it now. Was thinking about doing the possible suspension upgrade if needed around or after 100,000 to get my money's worth out of the stock parts, you know?