I wouldn't say the 416 is the most durable car out there, but with a few updates it can be pretty stout. Here's a few things I do to my cars to make them stronger. Perhaps others have some ideas as well.
1. Get a giant bumper. The Parma T2 or TC5 bumpers can be cut down with some work to fit.
2. Don't run the stock c-hubs. Get either aluminum ones from Square, or run the soft IFS composite.
3. Replace the ball studs in the steering rack (where you adjust ackermann) with the same piece that the outside from camber link connects to. The kingpin, or whatever it's called.
4. Replace the aluminum steering tie rods with titanium.
5. Ditch the aluminum ball studs and use the steel ones instead.
6. If you run a spool, use 46mm steel CVD's up front.
7. Use the 2pc suspension mounts in the front/rear position.
8. Use longer screws to hold the suspension mounts in both rear positions. This seems to reduce the chance of bending.
9. Learn to hit things with the front of your car. If you watch the good drivers, they never swipe anything with the side of their car. They always try to keep the wrecks in front of them and let their bumper do the work. I'm really beginning to think there's an art to knowing how to crash and hit things.
That's about all I can think of at the moment. All these cars seem like they're designed to be as light as possible, and for more forgiving tracks, like those with dots and rolled curbs. 'Round here, we use some pretty relentless boards, so a few precautions above what comes with the kit will go a long way.