Don't take CarFax as gospel....remember that CarFax just pulls data files from state inspection stations, dealer repair facilities, police accident reports etc, and then constructs their "report" based on what kind of data they can find about the VIN. I have seen reporting anomalies in these reports, where the vehicle had lees miles on it that it did the year before, etc. Think of CarFax as a guideline, it's more data than you had before, but it's not a definitive record of everything that happened to the vehicle, only the stuff that they were able to find for you. A 10 year old vehicle with 133k miles is about average for a passenger car, so this rig has traveled extensively. I would agree that a rig that has been exercised regularly is probably in better shape than one that has sat for long periods and has low miles. Of course you will have wear item like suspension parts, etc.
Regarding previous owners, DMV records are considered public information in all 50 states. Dealers typically don't provide that info because they don't want customers to get in the habit of asking where the used car came from. CarFax will tell you where/when it was titled, so you can tell the # of owners and where the vehicle was titled.
On the extended warranty, it is true that dealers make big profit off of these and sell whenever possible. However, they don't offer the warranty services themselves, they typically sell a policy provided by a third party. It's like insurance where they are betting that they won't have to repair tour vehicle after they collect your premium, so very likely that they have guidelines on mileage they are willing to insure. So I wouldn't blame the dealer or think they are purposely not offering an extended warranty because the unit is junk.
I would have a mechanic inspect it BEFORE you buy it, don't think you have any leverage in the 30 days after the sale. Worn out and ready to go is different from broken. If the dealer won't let you drive the rig to a mechanic, pay one to come with you to the dealer's lot.
