I have used these slides for many years. They are robust and easy to install (with special attention to tolerances and squareness!) and work flawlessly. My shop now has 11 drawers with 22" slides and 16 drawers with 16" slides. I also have a drawer of 24" slides on my desk that is 24" deep and 51" wide. The drawer is wider than recommended and I'm sure it's heavier than the recommended 100 pounds. If I'm not careful I assume the drawer can be stacked, but I'm always careful so I've never had a problem. My point is that you can safely exceed the recommended width and weight if you are careful and know what you are doing. "Slides (because they obviously don't make 30 inch slides)!