I did the same thing while looking for an Avalanche for the wife. Turns out a family member had a F150 that was registered as a lemon, and he didn't know it (he was the third owner).(checked all the rest of the cars in my household as well as some others I was looking at).
Dual alternators? lol Just kidding. Hey it beats paying $600 month for a new burb.I do not know if mine was an isolated thing but I had a 99 w/ 113000 on it and had to have the lower seals replaced $$, Two alternators, ABS sensors$$ Door locks electric $. Loved the truck, thought it was a little too many things wrong, but all of the 6 trucks including a 98 ext cab 4x4 not one problem!