Ag for Life said:
Put some money aside for door lock actuators. I've replaced 6 on my 2007 Tundra DC.
Also, plan for the water pump to go out every 90,000 miles.
The air injection pump problem is a crap shoot. Mine still works like new, but many go out. Get the bypass kit instead of repairing ($$$$$) it if they go out. https://hewitt-tech.com/store/index.php?l=product_detail&p=82
Other than that, they're pretty bulletproof. Mine is about to tick over 227,000 miles.
I have an 07 about to roll over 200K and have never had door lock issues. I bought it around 80K so maybe they had issues before I got it.
Water pump went out at exactly 90K. Replaced myself for around $150
AC condenser went out around 150K. Paid $1100 to replace, didn't have time to screw with removing the dashboard.
AIP went out around 110K but was replaced under warranty.
Overall I have probably spent around $1500-$2000 on non-routine maintenance (brakes, oil, tires, battery) since I bought the truck in 2015. That number would be way lower if I had had the time to do the AC condenser.