RE: the 12 reports
In some states where annual safety or emissions inspections are required, these inspections are recorded in the DMV office, with a report being logged on the VIN number. Carfax will have access to this and report it. This is possibly where the 12 reports came from. As well, each time a vehicle's license plate is renewed or another issued, some states log a record of it. Your truck being 12 years old, that's very likely what you'll see.
Carfax is simply logging whatever records they can dig up to help protect an innocent buyer.
In cases where a salvage title was issued for a vehicle, or if it was involved in an accident, those records, if available, are displayed. I think this sort of info. is more helpful than hurtful since some buyers don't have someone to verify the history and quality of a particular vehicle.
I have a Mustang collection, and have checked the histories of all mine with Carfax, sometimes just for the fun of it when I bought an unlimited search. I have a 1984 model that I bought new. It has only 75k miles on it now, however at some point in the 90s, a moron at our inspection station logged the mileage as 151,000-something instead of 51k. That record haunts this car in Carfax to this day and shows as posslble odometer tampering.
BUT, overall, I think it's a good deal. I was looking at a 1985 Mustang GT about 18 months ago through ebay that I really wanted, but a Carfax report showed possible odometer tampering (it was reported as lower at a sale than it had been at an inspection two years earlier) and it showed the car having been in an accident. The seller said it hadn't, so I knew enough to back off.
If you're looking for a teenager's car and don't want to get taken on a in-expensive car, I think the money for an unlimited 30-day (or whatever they're offereing now) report would be A TREMENDOUS VALUE to you. You'll be able to run this on any vehicle you consider, 1981 model or newer. You could verify what your current truck shows too, as this will stay there if you ever want to sell it.
Gordon