yeah, humans just arent adapted to work with the geometry that dogbones and drivecups are based on...
http://img50.imageshack.us/img50/1368/sdscs90015na1.jpg
that is all that was left of a drivecup that i used one day! it happened after a cartwheel down a slope...ive bent tons and tons of dogbones so i thought that they would always be the ones to give, maybe if we model the truck in a computer or something we can run simulations to find out what caused it to snap like that