Hi all, Just bought a 2011 GMC 1500, and have been thinking about leveling it out. My local truck parts supplier has a wide array of leveling kits from various suppliers, but there are all kinds of differences. First major question Plastic versus Alumnium, in my mind Alumnium would be stronger but then again why would there be so many plastic options. So what are the pro's and con's of plastic leveling blocks over alumnium ones? Second most leveling kits are based around blocks, but some are located on the spindle. Again what's the pro's and con's to that? I just want to make sure I am not building a squeaky disaster. Thanks!