Depending on the highway and the ruts that are dug into the pavement, tramlining is a problem with some tires that have soft sidewalls. I'm not familiar with the Nitto brand, so I can't comment, but the Sachs kit with new suspension bits will amplify any tire problems. When I put the Sachs in on my old 535 with new Bridgestone 17" 730's they drove nice and straight then started getting noisy after about 8000 miles. It was a characteristic of the tire and not the suspension. Do you think a stiffer sidewall would compensate?

Jr