You might try a specialty cabinet supply shop. There are crazy products out there you aren't going to find in most outlets.
I redid my kitchen with some amazing drawer sliders...may not be to code, but they are rated to 500 pounds, lock in the out position, and I built steps into the backs of the drawers to access high shelves on an opposite wall. The sliders are normally put into ambulances and utility trucks, but they work great. I would have never know about them if I didn't call my cabinet supply shop.
My dealer was A&H Turf in Montana. With some volume, I got wholesale prices.