In this video I take a look at the spare tire on the 3rd Gen Toyota Tundra. Mine is the limited model with stock wheels and tires. I recently got a flat tire while towing probably 7,000 lbs through the mountains and on some highways. I used the spare tire it came with, a Falken Wildpeak branded spare. It did really well and had the weight and speed ratings to match or exceed the stock tires.
If you're looking to get a matching spare because you're concerned about towing, maybe you don't need to.