Used Cars: certified used Toyota with small tires, tire pressure monitoring system, toyota minivan

Question

grand canyon country I purchased a certified used Toyota minivan late model from a Toyota dealership. They put new tires on the van at the time of sale. I had a lot of problems with the Tire Pressure Monitoring system, and after having an unrepairable flat a couple of weeks ago it became clear to me from the tire dealer that they put tires that are not recommended by the manufacturer. The load rate for the required tires is 98T, they put on a 95T, this is not the load rate recommended by Toyota for the van. They say that the tire is safe and stand by this practice and even go as far to say people do custom wheels all the time and I assumed the risk of not having OEM on the car as I was buying a used car. The tire manufacturer also does not recommend the replaced tire for my van. I now have the appropriate size tire for my van. The tire they placed on the van was 225 R55 17 and the recommended tire by Toyota is 225 R60 17. At this point I could careless about the money, this is about safety and princible, and public safety. The sale to me was deceptive and violated the regulatory standards that the NHTSA sets forth.  

Answer
Well.....I understand and agree with both sides of this situation.  This is a gray line, that I think you would have a hard time persuing legally.  I really did not understand what the question was you were asking, but if I were you, just let it be, and do what you are doing.
What you need to understand though (and I am surprised the dealership did not say this), is when you are dealing with these tire pressure monitors, they are not a perfect idea.
I personally own a 04 Expedition with them, but when it is real cold, the light comes on, until the tires get up to normal pressure, and sometimes it just flashes for reasons I am not sure of.
When you are dealing with computer type stuff, they all have their glitches, and you just kind of learn when they do it, and go with it.  
I dont think you should hold a grudge to the dealership for the tires they put on, and I think you need to take what the tire dealership says with a grain of salt, because in my experience, these tire places are all about saying things to scare you into only believing what they say.
And I can PROMISE you, most of what they say is BS!  They can get all technical about manufacturers say this and say that...blah, blah, blah......I can assure you that vehicle Manufacturers know, and understand, that people are going to not always obey their rules, and these vehicles are made to be flexible, especially on situations like this.
Now it is very wise of you to be this concerned, because in the end, safety is probably one of the main reasons you bought a Toyota, but I have a hard time believing that this very minute difference in tires, hendered your safety, in any way.
I have sold imports, and totally understand you import buyers, you are very smart, and savy, and exacting on all things that are important, but I can tell you from my experience, this is not an issue to take concern with.