No major problems. The motor is a little noisy on cold starts if the temp. is in the 30s or below, but quiets down after it warms up.
The serpentine belt squeals a little if it's cold and moist outside, but will stop after the motor warms up. A shot of silicone spray seems to help quiet this. The back seat area is a little small and upright for adults, but fine for the kids.
I love the way this truck handles. It rides better than any American made truck I've have rode in and most cars for that matter. Even with the off road suspension, it rides like a dream. The small v8 is power-full and responsive. This is a quality built truck and I expect to get at least 200,000 miles out of it. When I tow my bass boat, I can hardly tell it's there. If I had to go out and buy an other truck today, it would be a Tundra.
It rides more smoothly than the American made trucks because its suspension is weak and flimsy. A truck with a springy suspension is useless for hauling anything. If it is a real truck meant for doing real work, it will ride roughly because the suspension will be re-enforced for doing work. I've seen Tacoma's and Tundra's hauling things in their beds that my accord could haul, and the back of the beds are nearly sagging to the ground. I once saw a Tundra try to pull a boat (that an S10 or Ranger could've pulled) out of Lake Cumberland and the engine sounded like it was going to cry or die, one or the other. If you think I'm lying, simply park your Toyota next to an F-150, Silverado, or RAM and lay down on the ground and take a look at what is attaching the wheels to your Toyota and compare that to what is attaching the wheels to the American made trucks. I think you'll be disappointed. If that isn't enough, try to load 700lbs or more in the bed and see if you don't have yourself a low-rider!