Ordered bearings for my MR03-S.

Do you all use any special wheel nuts or just the plastic ones that come with the car?
I ask because one of the plastic nuts stripped when I hit something and the rear axle came flying apart. I sounds like I am abusing my Mini-Z. But I am glad the nut was the only thing that broke. Drive axle wasn't bent.

This is my test mule car which will ultimately be my guest/visitor car so hopefully I get the hang of its limits by the time I order my 2nd MR03-S for me.