Trail rated 2008 Yaris hit 300,000 miles today

[RutherfordmanX]

2008 Yaris made it to 300,000 miles this morning. So far I have put a new water pump, alternator and a used evap canister on it in addition to the standard maintenance stuff. Modifications include:
Custom front air dam and fog light courtesy of raccoon crossing at 55 mph.
Custom rear quarter panel courtesy of deer hit at 50 mph - yes the deer hit me!
Why is it trail rated? It spent the last 12 years having to negotiate 9 miles up and down of the nastiest gravel road in the county with an elevation gain of around 1600 feet. Can't believe I still have the original CV joints. Engine still purrs but I am wondering how long the auto trans will last