I'm sure there are specs out there...will see if I can locate any. For that large of a drawer and weight, you may consider doing a thicker bottom, like 1/2" ply.
Edit: Only finding clearance specs, not really anything on drawer size. I think that based on simple physics you could determine if additional slides are needed or not, say if the drawer was 3' tall and top heavy, you may want to have slides at the bottom side and maybe a set towards the top. The trash can and pan pull-outs I did for my kitchen have no problem supporting the weight from the bottom alone with the 100# glides I used.