Never had a problem with my "RevoSpec" slipper in my 3905 Maxx... It weighs ~13lbs on 6s with a 1520. So...
Even still you can get the Hot Racing Double slipper with 6 Traxxas Al pads and have a GREAT Slipper system. I know that would hold up to whatever you throw at it...
Maxx - FLM, MMM, CD Med.36x706s
Raja - FLM Ext. MM, 1512, 4s
SC8ight - MMM, 1520, 6s
D8T - MMM 1717 6s