Knuckles,hubs and front arms. Maybe the shock shafts are all you will really need and breaking those is hard to do. You would have to wreck pretty bad a few times like I did my first time out with the car to break.

The car is built well and strong but everything has a breaking point. Land any car on its side enough and something will break lol.

Maybe front drive shafts?? Unless you plan to bend it back if it does bend.