Here is what someone on another forum asked and was answered. My experience is widths up to 41" with 100lbs glides. The better the glides, the lesser chance of racking. That will be a pretty tall glide, though, but a little more height vs. racking is a good thing.
I'm beginning a kitchen island and my wife wants those nice wide deep drawers for her pots and plates. I see that they are manufactured up to 36" wide, but the drawer slide manufacturers seem to say that drawers shouldn't be wider than the slide is long. Is a 36" wide x ~24" long drawer safe w/ a 100 lb ball bearing slide? Or will it rack? Would a slide down the middle help? This seems like a mounting nightmare. Does anybody have any advice or recommendations for products? What do the commercial guys use on the wide cabinets? Thanks in advance,
Our kitchen has lots of 36" wide pull out shelves behind doors for pots and pans. I used Accuride 100 pound full extension slides(the best in my opinion).
The sizes you list are fine. Use high quality slides and don't leave sloppy side room which is the cause of racking. I made wide drawers and pull outs routinely and using slides that dealt with racking pressures well is the key. Full extension slides are two stage devices and will be more prone to racking than a single stage slide but good ones can easily handle it. I'd also suggest shallow pull outs with sides around 4 inches for the larger drawers rather than high sided drawers, it provides easier access from the side and greater visibility. Lee
I hope this helps you,