Home Depot has some heavy duty slides that are usually in the Hardware Section. Basically just heavy drawer slides. Inside of the display drawer they will have the weight rating for each one.
I think the brand is everbilt
Here are the ones I got. Mounted them on a piece of aluminum angle. For the tray use aluminum angle for the perimeter with aluminum treadplate riveted to it for the floor.
https://www.homedepot.com/p/Everbilt...ZP-W/302867528